workflows: replace sudomateo/setup-packer

The sudomateo/setup-packer action is archived and was replaced by
hashicorp/setup-packer, so we can use this one instead.

.github/workflows/acceptance-test.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Set up Cloud SDK
         uses: google-github-actions/setup-gcloud@e30db14379863a8c79331b04a9969f4c1e225e0b # v1.1.1
       - name: Install Packer
-        uses: sudomateo/setup-packer@v1 # TSCCR: no entry for repository "sudomateo/setup-packer"
+        uses: hashicorp/setup-packer@v2.0.0
         with:
           packer-version: latest
       - name: 'Authenticate to Google Cloud'