Attempt to fix CI again

Author: arvkevi

.github/workflows/tests.yml

@@ -11,10 +11,10 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest, macos-latest, windows-latest]
         exclude:  # Python < v3.8 does not support Apple Silicon ARM64.
-        - python: "3.7"
+        - python-version: "3.7"
           os: macos-latest
         include:  # So run those legacy versions on Intel CPUs.
-        - python: "3.7"
+        - python-version: "3.7"
           os: macos-13
     env:
       OS: ${{ matrix.os }}