Update google-github-actions/auth action to v2.1.8 (#3080)

| datasource  | package                    | from   | to     |
| ----------- | -------------------------- | ------ | ------ |
| github-tags | google-github-actions/auth | v2.1.7 | v2.1.8 |

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.yml

@@ -82,7 +82,7 @@ jobs:
 
       - name: Authenticate to Google Cloud
         id: auth
-        uses: google-github-actions/auth@6fc4af4b145ae7821d527454aa9bd537d1f2dc5f # v2.1.7
+        uses: google-github-actions/auth@71f986410dfbc7added4569d411d040a91dc6935 # v2.1.8
         with:
           token_format: access_token
           workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY }}

.github/workflows/nfr.yml

@@ -86,7 +86,7 @@ jobs:
 
       - name: Authenticate to Google Cloud
         id: auth
-        uses: google-github-actions/auth@6fc4af4b145ae7821d527454aa9bd537d1f2dc5f # v2.1.7
+        uses: google-github-actions/auth@71f986410dfbc7added4569d411d040a91dc6935 # v2.1.8
         with:
           token_format: access_token
           workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY }}