fix(renovate): pin renovate-version — the action's default (39) rejects renovate.json5

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.gitea/workflows/renovate.yaml

@@ -158,6 +158,11 @@ jobs:
           # asserts that every `configurationFile:` here names a file that exists.
           configurationFile: renovate.json5
           token: ${{ secrets.RENOVATE_TOKEN }}
+          # PINNED 2026-10-29. Unset, this action version runs Renovate `39` (action.yml
+          # `renovate-version` default at v41.0.9), i.e. 39.264.0, and renovate.json5 uses
+          # `managerFilePatterns` (>= 40.2.0): under 39.x validation fails with five errors and
+          # the run stops at CONFIG_VALIDATION. #79 validated against `latest`, not this.
+          renovate-version: 44.167.0
         env:
           # Self-hosted Gitea. `platform` + `endpoint` were the two values renovate.json's own
           # header said were "set at runtime by the operator's renovate runner" — this is that