Update lucacome/docker-image-update-checker action to v2 (#166)

| datasource  | package                              | from | to |
| ----------- | ------------------------------------ | ---- | -- |
| github-tags | lucacome/docker-image-update-checker | v1   | v2 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build-docker.yml

@@ -40,7 +40,7 @@ jobs:
           echo "image=${image}" >> $GITHUB_OUTPUT
       - name: Check if update needed for ${{ steps.variables.outputs.image }}
         id: update
-        uses: lucacome/docker-image-update-checker@v1
+        uses: lucacome/docker-image-update-checker@v2
         with:
           base-image: library/nginx:mainline-alpine
           image: ${{ steps.variables.outputs.image }}