fix(ci): bump back to lychee-action v2.9.0, both versions are ASF-allowlisted

Checked apache/infrastructure-actions' approved_patterns.yml directly
(the actual source of truth for the org allowlist) instead of relying
on secondhand info: both v2.8.0 (8646ba30...) and v2.9.0
(e7477775...) are already present. The earlier repin to v2.8.0 assumed
only that SHA was allowed; that assumption was wrong, so bumping back
to the newer v2.9.0 costs nothing and there's no reason to stay on the
older tag.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/superset-docs-verify.yml

@@ -21,8 +21,8 @@ permissions:
   contents: read
 
 jobs:
-  linkinator:
-    # See docs here: https://github.com/marketplace/actions/linkinator
+  lychee:
+    # See docs here: https://github.com/lycheeverse/lychee-action
     # Only run on pull_request, not workflow_run
     if: github.event_name == 'pull_request'
     name: Link Checking
@@ -31,37 +31,52 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
-      # Do not bump this linkinator-action version without opening
-      # an ASF Infra ticket to allow the new version first!
-      - uses: JustinBeckwith/linkinator-action@af984b9f30f63e796ae2ea5be5e07cb587f1bbd9 # v2.3
+      # Restores the on-disk request cache (.lycheecache) lychee writes when
+      # `--cache` is set, so re-runs don't re-check every external link from
+      # scratch. Key never matches exactly (github.run_id is unique per run),
+      # so actions/cache always saves a fresh copy afterwards; restore-keys
+      # falls back to the most recent prior cache on lookup.
+      - uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        with:
+          path: .lycheecache
+          key: lychee-cache-${{ github.run_id }}
+          restore-keys: lychee-cache-
+      # v2.8.0 and v2.9.0 are both on ASF Infra's action allowlist
+      # (apache/infrastructure-actions approved_patterns.yml) as of this
+      # writing. Do not bump past v2.9.0 without opening an Infra ticket
+      # to allow the new SHA first!
+      - uses: lycheeverse/lychee-action@e7477775783ea5526144ba13e8db5eec57747ce8 # v2.9.0
         continue-on-error: true # This will make the job advisory (non-blocking, no red X)
         with:
-          paths: "**/*.md, **/*.mdx"
-          linksToSkip: >-
-            ^https://github.com/apache/(superset|incubator-superset)/(pull|issues)/\d+,
-            ^https://github.com/apache/(superset|incubator-superset)/commit/[a-f0-9]+,
-            superset-frontend/.*CHANGELOG\.md,
-            http://localhost:8088/,
-            http://127.0.0.1:3000/,
-            http://localhost:9001/,
-            https://charts.bitnami.com/bitnami,
-            https://www.li.me/,
-            https://www.fanatics.com/,
-            https://tails.com/gb/,
-            https://www.techaudit.info/,
-            https://avetilearning.com/,
-            https://www.udemy.com/,
-            https://trustmedis.com/,
-            http://theiconic.com.au/,
-            https://dev.mysql.com/doc/refman/5.7/en/innodb-limits.html,
-            ^https://img\.shields\.io/.*,
-            https://vkusvill.ru/,
-            https://www.linkedin.com/in/mark-thomas-b16751158/,
-            https://theiconic.com.au/,
-            https://wattbewerb.de/,
-            https://timbr.ai/,
-            https://opensource.org/license/apache-2-0,
-            https://www.plaidcloud.com/
+          fail: false
+          args: >-
+            --verbose --no-progress
+            --cache --max-cache-age 7d
+            --exclude '^https://github.com/apache/(superset|incubator-superset)/(pull|issues)/\d+'
+            --exclude '^https://github.com/apache/(superset|incubator-superset)/commit/[a-f0-9]+'
+            --exclude 'superset-frontend/.*CHANGELOG\.md'
+            --exclude 'http://localhost:8088/'
+            --exclude 'http://127.0.0.1:3000/'
+            --exclude 'http://localhost:9001/'
+            --exclude 'https://charts.bitnami.com/bitnami'
+            --exclude 'https://www.li.me/'
+            --exclude 'https://www.fanatics.com/'
+            --exclude 'https://tails.com/gb/'
+            --exclude 'https://www.techaudit.info/'
+            --exclude 'https://avetilearning.com/'
+            --exclude 'https://www.udemy.com/'
+            --exclude 'https://trustmedis.com/'
+            --exclude 'http://theiconic.com.au/'
+            --exclude 'https://dev.mysql.com/doc/refman/5.7/en/innodb-limits.html'
+            --exclude '^https://img\.shields\.io/.*'
+            --exclude 'https://vkusvill.ru/'
+            --exclude 'https://www.linkedin.com/in/mark-thomas-b16751158/'
+            --exclude 'https://theiconic.com.au/'
+            --exclude 'https://wattbewerb.de/'
+            --exclude 'https://timbr.ai/'
+            --exclude 'https://opensource.org/license/apache-2-0'
+            --exclude 'https://www.plaidcloud.com/'
+            './**/*.md' './**/*.mdx'
 
   build-on-pr:
     # Build docs when PR changes docs/** (uses committed databases.json)