Fix BushelCloud workflow to use subrepo branch

Update macOS build workflow to use 'subrepo' branch instead of 'v3.0.0-alpha.2-bushel-subrepo' for consistency with Ubuntu build and CodeQL workflows.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: leogdion

.github/workflows/BushelCloud.yml

@@ -123,7 +123,7 @@ jobs:
 
       - name: Update Package.swift to use remote BushelKit branch
         run: |
-          sed -i '' 's|\.package(path: "\.\./BushelKit")|.package(url: "https://github.com/brightdigit/BushelKit.git", branch: "v3.0.0-alpha.2-bushel-subrepo")|g' Package.swift
+          sed -i '' 's|\.package(path: "\.\./BushelKit")|.package(url: "https://github.com/brightdigit/BushelKit.git", branch: "subrepo")|g' Package.swift
           rm Package.resolved
       - name: Build and Test
         uses: brightdigit/swift-build@v1.4.2