fix syntax error in CI file

Author: petercorke

.github/workflows/main.yml

@@ -25,13 +25,13 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         exclude:
           - os: macos-13
-            version: "3.7"
+            python-version: "3.7"
           - os: macos-13
-            version: "3.8"
+            python-version: "3.8"
           - os: macos-13
-            version: "3.9"
+            python-version: "3.9"
           - os: macos-13
-            version: "3.10"
+            python-version: "3.10"
     steps:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5