Bump step-security/harden-runner from 2.12.1 to 2.12.2

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.12.1 to 2.12.2.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@002fdce...6c439dc)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.12.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/push_gem.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@002fdce3c6a235733a90a27c80493a3241e56863 # v2.12.1
+        uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
         with:
           egress-policy: audit