default branch to 3.4

Author: soyuka

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
           VALIDATE_ALL_CODEBASE: false
           VALIDATE_EDITORCONFIG: false
           VALIDATE_JSCPD: false
-          DEFAULT_BRANCH: main
+          DEFAULT_BRANCH: 3.4
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - uses: actions/cache@v3