Update google-github-actions/auth action to v2.1.4 (#310)

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

Author: renovate[bot]

.github/workflows/iac.yml

@@ -155,7 +155,7 @@ jobs:
 
       - id: 'auth'
         name: 'Authenticate to Google Cloud'
-        uses: 'google-github-actions/[email protected].3'
+        uses: 'google-github-actions/[email protected].4'
         if: inputs.GCP_ENV == true
         with:
           workload_identity_provider: ${{ inputs.GCP_WIP }}