Merge pull request #299 from ruby/dependabot/github_actions/step-security/harden-runner-2.19.3

Bump step-security/harden-runner from 2.19.1 to 2.19.3

Author: olleolleolle

.github/workflows/push_gem.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450 # v2.19.1
+        uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
         with:
           egress-policy: audit