Update renovatebot/github-action action to v42.0.4 (#120)

Co-authored-by: small-hack-renovate[bot] <151926327+small-hack-renovate[bot]@users.noreply.github.com>

Author: small-hack-renovate[bot]

.github/workflows/renovate.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Self-hosted Renovate
         # renovate keeps itself up to date
-        uses: renovatebot/[email protected].0
+        uses: renovatebot/[email protected].4
         with:
           token: '${{ steps.get_token.outputs.token }}'
           configurationFile: .github/renovate-config.json