fix(ci): Sanitize PR head.ref #5013
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This fixes a minor GitHub Actions workflow injection vulnerability by sanitizing the branch name from the PR head.
I'm just making a PR because most risk is mitigated as the workflow does not use secrets and the
GITHUB_TOKENpermissions are restricted topull-requests: writeandissues: write. The worst an attacker could do is modify other PR descriptions, titles, mess with issues - a nuisance but not a supply chain attack.Release Note