Change region to europe-west1 to allow use of v4-v6 subnet

Author: shaun-nx

.github/workflows/nfr.yml

@@ -120,8 +120,8 @@ jobs:
           echo "NGINX_PREFIX=ghcr.io/nginx/nginx-gateway-fabric/nginx" >> vars.env
           echo "NGINX_PLUS_PREFIX=us-docker.pkg.dev/${{ secrets.GCP_PROJECT_ID }}/nginx-gateway-fabric/nginx-plus" >> vars.env
           echo "GKE_CLUSTER_NAME=nfr-tests-${{ github.run_id }}-${{ matrix.type }}" >> vars.env
-          echo "GKE_CLUSTER_ZONE=us-west1-b" >> vars.env
-          echo "GKE_CLUSTER_REGION=us-west1" >> vars.env
+          echo "GKE_CLUSTER_ZONE=europe-west1-b" >> vars.env
+          echo "GKE_CLUSTER_REGION=europe-west1" >> vars.env
           echo "GKE_PROJECT=${{ secrets.GCP_PROJECT_ID }}" >> vars.env
           echo "GKE_SVC_ACCOUNT=${{ secrets.GCP_SERVICE_ACCOUNT }}" >> vars.env
           echo "GKE_NODES_SERVICE_ACCOUNT=${{ secrets.GKE_NODES_SERVICE_ACCOUNT }}" >> vars.env