fix(dashboards): Fix mypy error in dashboard revisions endpoint

OrganizationDashboardBase types permission_classes as
tuple[type[OrganizationDashboardsPermission]], so overriding it with
OrganizationPermission caused a mypy incompatible assignment error.
Removing the override uses the inherited OrganizationDashboardsPermission,
which already permits GET.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: skaasten

src/sentry/dashboards/endpoints/organization_dashboard_revisions.py

@@ -9,7 +9,6 @@
 from sentry.api.api_owners import ApiOwner
 from sentry.api.api_publish_status import ApiPublishStatus
 from sentry.api.base import cell_silo_endpoint
-from sentry.api.bases.organization import OrganizationPermission
 from sentry.api.paginator import OffsetPaginator
 from sentry.dashboards.endpoints.organization_dashboard_details import OrganizationDashboardBase
 from sentry.models.dashboard import Dashboard, DashboardRevision
@@ -43,7 +42,6 @@ class OrganizationDashboardRevisionsEndpoint(OrganizationDashboardBase):
         "GET": ApiPublishStatus.PRIVATE,
     }
     owner = ApiOwner.DASHBOARDS
-    permission_classes = (OrganizationPermission,)
 
     def get(
         self,