Merge pull request #48 from ruby/dependabot/github_actions/step-security/harden-runner-2.15.1

Bump step-security/harden-runner from 2.15.0 to 2.15.1

Author: hsbt

.github/workflows/push_gem.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
+        uses: step-security/harden-runner@58077d3c7e43986b6b15fba718e8ea69e387dfcc # v2.15.1
         with:
           egress-policy: audit