bump step-security/harden-runner from 2.12.0 to 2.13.3

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.12.0 to 2.13.3.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@0634a26...df199fb)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.13.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Author: dependabot[bot]

.github/workflows/push_gem.yml

@@ -22,7 +22,7 @@ jobs:
         ruby: ["ruby-3.4", "jruby-9.4"]
 
     steps:
-      - uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+      - uses: step-security/harden-runner@df199fb7be9f65074067a9eb93f12bb4c5547cf2 # v2.13.3
         with:
           egress-policy: audit