fix: SSH Tunnel creation with dynamic form (#24196)

(cherry picked from commit 226c7f807d)

superset/db_engine_specs/base.py

@@ -1773,6 +1773,10 @@ class BasicParametersSchema(Schema):
     encryption = fields.Boolean(
         required=False, description=__("Use an encrypted connection to the database")
     )
+    ssh = fields.Boolean(
+        required=False,
+        metadata={"description": __("Use an ssh tunnel connection to the database")},
+    )
 
 
 class BasicParametersType(TypedDict, total=False):