chore: update files for release 6.0.0 (#36745)

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -41,8 +41,8 @@ body:
       label: Superset version
       options:
         - master / latest-dev
+        - "6.0.0"
         - "5.0.0"
-        - "4.1.3"
     validations:
       required: true
   - type: dropdown

UPDATING.md

@@ -125,8 +125,30 @@ See `superset/mcp_service/PRODUCTION.md` for deployment guides.
 ---
 
 - [35621](https://github.com/apache/superset/pull/35621): The default hash algorithm has changed from MD5 to SHA-256 for improved security and FedRAMP compliance. This affects cache keys for thumbnails, dashboard digests, chart digests, and filter option names. Existing cached data will be invalidated upon upgrade. To opt out of this change and maintain backward compatibility, set `HASH_ALGORITHM = "md5"` in your `superset_config.py`.
-- [33055](https://github.com/apache/superset/pull/33055): Upgrades Flask-AppBuilder to 5.0.0. The AUTH_OID authentication type has been deprecated and is no longer available as an option in Flask-AppBuilder. OpenID (OID) is considered a deprecated authentication protocol - if you are using AUTH_OID, you will need to migrate to an alternative authentication method such as OAuth, LDAP, or database authentication before upgrading.
 - [35062](https://github.com/apache/superset/pull/35062): Changed the function signature of `setupExtensions` to `setupCodeOverrides` with options as arguments.
+
+### Breaking Changes
+- [36317](https://github.com/apache/superset/pull/36317): The `CUSTOM_FONT_URLS` configuration option has been removed. Use the new per-theme `fontUrls` token in `THEME_DEFAULT` or database-managed themes instead.
+  - **Before:**
+  ```python
+  CUSTOM_FONT_URLS = [
+    "https://fonts.example.com/myfont.css",
+  ]
+  ```
+  - **After:**
+  ```python
+  THEME_DEFAULT = {
+    "token": {
+      "fontUrls": [
+        "https://fonts.example.com/myfont.css",
+        ],
+        # ... other tokens  
+    }
+  }
+  ```
+
+## 6.0.0
+- [33055](https://github.com/apache/superset/pull/33055): Upgrades Flask-AppBuilder to 5.0.0. The AUTH_OID authentication type has been deprecated and is no longer available as an option in Flask-AppBuilder. OpenID (OID) is considered a deprecated authentication protocol - if you are using AUTH_OID, you will need to migrate to an alternative authentication method such as OAuth, LDAP, or database authentication before upgrading.
 - [34871](https://github.com/apache/superset/pull/34871): Fixed Jest test hanging issue from Ant Design v5 upgrade. MessageChannel is now mocked in test environment to prevent rc-overflow from causing Jest to hang. Test environment only - no production impact.
 - [34782](https://github.com/apache/superset/pull/34782): Dataset exports now include the dataset ID in their file name (similar to charts and dashboards). If managing assets as code, make sure to rename existing dataset YAMLs to include the ID (and avoid duplicated files).
 - [34536](https://github.com/apache/superset/pull/34536): The `ENVIRONMENT_TAG_CONFIG` color values have changed to support only Ant Design semantic colors. Update your `superset_config.py`:
@@ -143,35 +165,10 @@ Note: Pillow is now a required dependency (previously optional) to support image
 - [33116](https://github.com/apache/superset/pull/33116) In Echarts Series charts (e.g. Line, Area, Bar, etc.) charts, the `x_axis_sort_series` and `x_axis_sort_series_ascending` form data items have been renamed with `x_axis_sort` and `x_axis_sort_asc`.
   There's a migration added that can potentially affect a significant number of existing charts.
 - [32317](https://github.com/apache/superset/pull/32317) The horizontal filter bar feature is now out of testing/beta development and its feature flag `HORIZONTAL_FILTER_BAR` has been removed.
-- [31590](https://github.com/apache/superset/pull/31590) Marks the beginning of intricate work around supporting dynamic Theming, and breaks support for [THEME_OVERRIDES](https://github.com/apache/superset/blob/732de4ac7fae88e29b7f123b6cbb2d7cd411b0e4/superset/config.py#L671) in favor of a new theming system based on AntD V5. Likely this will be in disrepair until settling over the 5.x lifecycle.
+- [31590](https://github.com/apache/superset/pull/31590) Marks the begining of intricate work around supporting dynamic Theming, and breaks support for [THEME_OVERRIDES](https://github.com/apache/superset/blob/732de4ac7fae88e29b7f123b6cbb2d7cd411b0e4/superset/config.py#L671) in favor of a new theming system based on AntD V5. Likely this will be in disrepair until settling over the 5.x lifecycle.
 - [32432](https://github.com/apache/superset/pull/31260) Moves the List Roles FAB view to the frontend and requires `FAB_ADD_SECURITY_API` to be enabled in the configuration and `superset init` to be executed.
 - [34319](https://github.com/apache/superset/pull/34319) Drill to Detail and Drill By is now supported in Embedded mode, and also with the `DASHBOARD_RBAC` FF. If you don't want to expose these features in Embedded / `DASHBOARD_RBAC`, make sure the roles used for Embedded / `DASHBOARD_RBAC`don't have the required permissions to perform D2D actions.
 
-### Breaking Changes
-
-#### CUSTOM_FONT_URLS removed
-
-The `CUSTOM_FONT_URLS` configuration option has been removed. Use the new per-theme `fontUrls` token in `THEME_DEFAULT` or database-managed themes instead.
-
-**Before (5.x):**
-```python
-CUSTOM_FONT_URLS = [
-    "https://fonts.example.com/myfont.css",
-]
-```
-
-**After (6.0):**
-```python
-THEME_DEFAULT = {
-    "token": {
-        "fontUrls": [
-            "https://fonts.example.com/myfont.css",
-        ],
-        # ... other tokens
-    }
-}
-```
-
 ## 5.0.0
 
 - [31976](https://github.com/apache/superset/pull/31976) Removed the `DISABLE_LEGACY_DATASOURCE_EDITOR` feature flag. The previous value of the feature flag was `True` and now the feature is permanently removed.