Code changes to support the master->main branch switch (#701)

.github/workflows/test.yml

@@ -3,7 +3,7 @@ name: Test
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
     paths-ignore:
       - 'docs/**'

.github/workflows/update-dependencies.yml

@@ -27,7 +27,7 @@ jobs:
         private_key: ${{ secrets.CIBUILDWHEEL_BOT_APP_PRIVATE_KEY }}
 
     - name: Create Pull Request
-      if: github.ref == 'refs/heads/master' && github.repository == 'pypa/cibuildwheel'
+      if: github.ref == 'refs/heads/main' && github.repository == 'pypa/cibuildwheel'
       uses: peter-evans/create-pull-request@v3
       with:
         commit-message: Update dependencies