Merge pull request #329 from ruby/dependabot/github_actions/step-security/harden-runner-2.19.4

Bump step-security/harden-runner from 2.19.3 to 2.19.4

Author: hsbt

.github/workflows/push_gem.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
         with:
           egress-policy: audit