fix(publish): checkout main branch

.github/workflows/pypi-publish.yaml

@@ -26,13 +26,13 @@ jobs:
 
       - name: Commit updated pyproject.toml
         run: |
-          git fetch origin main
-          git checkout main
+          git fetch origin master
+          git checkout master
           git config user.name "GitHub Actions"
           git config user.email "actions@github.com"
           git add pyproject.toml
           git commit -m "Bump version to ${{ env.version }}"
-          git push origin main
+          git push origin master
         working-directory: src/python
 
       - name: Install dependencies