chore(deps): update renovatebot/github-action action to v40.3.4 (#462)

Co-authored-by: grafanarenovatebot[bot] <146220760+grafanarenovatebot[bot]@users.noreply.github.com>

Author: grafanarenovatebot[bot]

.github/workflows/renovate.yml

@@ -56,7 +56,7 @@ jobs:
           private-key: ${{ env.GRAFANA_RENOVATE_PRIVATE_KEY }}
 
       - name: Self-hosted Renovate
-        uses: renovatebot/github-action@7743ec9e19ceeb61a3862c5d4131e6710195af11 # v40.3.3
+        uses: renovatebot/github-action@80eaf969abf68ad62aa94d9ab392421b31621634 # v40.3.4
         with:
           configurationFile: .github/renovate-config.json
           # renovate: datasource=docker depName=ghcr.io/renovatebot/renovate