Reorder and explicitly switch mono

Author: filmor

.github/workflows/ci.yml

@@ -41,12 +41,17 @@ jobs:
     runs-on: ${{ matrix.os }}
     needs: build
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-24.04, ubuntu-24.04-arm, windows-latest, windows-11-arm, macos-15, macos-15-arm64]
         python: ['3.14', '3.13', '3.12', '3.11', '3.10', '3.9', '3.8'] # pypy3
 
     steps:
-    - uses: actions/checkout@v4
+    - name: Set Environment on macOS
+      uses: maxim-lobanov/setup-xamarin@v1
+      if: ${{ matrix.os.category == 'macos' }}
+      with:
+        mono-version: latest
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v5
@@ -70,6 +75,8 @@ jobs:
       run: |
         choco install -y mono ${{ matrix.python == 'pypy3' && '--x86' || '' }}
 
+    - uses: actions/checkout@v4
+
     - name: Install dependencies
       run: |
         uv venv