ci: Change event from published to released

.github/workflows/update-major-tag.yml

@@ -2,17 +2,15 @@ name: Update major tag
 
 on:
   release:
-    types: [published]
+    types: [released]
 
 jobs:
   update:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
-
       - uses: actions/checkout@v2.3.4
 
       - name: Update major tag
-      if: github.event.release.prerelease == false
         run: |
           git config user.name "${GITHUB_ACTOR}"
           git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"