ci: properly use master

Author: RedVortexDev

.github/workflows/build.yml

@@ -42,4 +42,4 @@ jobs:
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add Proto.md
           git commit -m "chore: update protobuf API docs"
-          git push origin HEAD:main
+          git push origin HEAD:master