fix: ubuntu version bug

Author: Niraj-Kamdar

.github/workflows/release-pr.yaml

@@ -9,7 +9,7 @@ jobs:
       github.event.pull_request.merged &&
       endsWith(github.event.pull_request.title, '/workflows/release-pr') &&
       github.event.pull_request.user.login != 'polywrap-build-bot'
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -79,7 +79,7 @@ jobs:
 
   Release-PR:
     needs: Pre-Check
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v3