chore: pin github actions by commit hash (#2648)

Author: ankpshah

.github/workflows/release_pr.yml

@@ -24,7 +24,7 @@ jobs:
         ref: ${{ env.BASE_BRANCH }}
         fetch-depth: 0
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@8575951200e472d5f2d95c625da0c7bec8217c42 # v1.161.0
       with:
         ruby-version: 2.7
     - name: Install dependencies