Merge branch '343070-fatal-bad-revision-master-in-db-check-migrations-job' into 'master'

ci: Fetch target branch in 'db:check-migrations'

See merge request gitlab-org/gitlab!73256

.gitlab/ci/rails.gitlab-ci.yml

@@ -360,6 +360,7 @@ db:check-migrations:
     - .db-job-base
     - .rails:rules:ee-and-foss-mr-with-migration
   script:
+    - git fetch origin $CI_MERGE_REQUEST_TARGET_BRANCH_NAME:$CI_MERGE_REQUEST_TARGET_BRANCH_NAME --depth 20
     - scripts/validate_migration_schema
   allow_failure: true