Add macOS legacy 10.15 to manual build workflow

Author: GarboMuffin

.github/workflows/build.yml

@@ -55,7 +55,7 @@ jobs:
     - name: Package
       run: |
         node release-automation/build.js --mac --universal
-        node release-automation/build.js --mac-legacy-10.13-10.14 --x64
+        node release-automation/build.js --mac-legacy-10.13-10.14 --mac-legacy-10.15 --x64
     - name: Upload artifacts to GitHub Actions
       uses: actions/upload-artifact@v4
       with: