Merge pull request #56 from ruby/dependabot/github_actions/step-security/harden-runner-2.13.1

Bump step-security/harden-runner from 2.12.2 to 2.13.1

Author: hsbt

.github/workflows/push_gem.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
       # Set up
       - name: Harden Runner
-        uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
         with:
           egress-policy: audit