chore: Use Ruby 3.0 for the release PR workflow (#429)

Author: vincetran

.github/workflows/release_pr.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@8575951200e472d5f2d95c625da0c7bec8217c42 # v1
       with:
-        ruby-version: 2.7
+        ruby-version: "3.0"
     - name: Install dependencies
       run: |
         cd build-support