Escape PR branch name in workflow

[stone-z]

What does this PR do?

Towards https://github.com/giantswarm/giantswarm/issues/32276 / follow-up from #405. One more value to escape

Do the docs need to be updated?

No

Should this change be mentioned in the release notes?

No

[github-actions]

There were no differences in the rendered Helm template.

Output

=== Differences when rendered with values file helm/cluster/ci/test-cgroupsv1-values.yaml ===

No difference


=== Differences when rendered with values file helm/cluster/ci/test-required-values.yaml ===

No difference


=== Differences when rendered with values file helm/cluster/ci/test-zot-mc-and-local-values.yaml ===

No difference


=== Differences when rendered with values file helm/cluster/ci/test-zot-mc-values.yaml ===

No difference


=== Differences when rendered with values file helm/cluster/ci/test-zot-only-local-values.yaml ===

No difference


=== No differences at all ===

[taylorbot]

Hey @stone-z, a test pull request has been created for you in the cluster-aws repo! Go to pull request giantswarm/cluster-aws#1000 in order to test your cluster chart changes on AWS.