update python and os x

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
-        python-version: 3.11
+        python-version: "3.11"
     - uses: pre-commit/action@v3.0.0
 
   tests:
@@ -26,10 +26,10 @@ jobs:
         # Only test the latest major release of Sphinx because otherwise we need to
         # keep multiple versions of regression tests on file and this creates lots of
         # noise in the tests.
-        sphinx: ["~=5.0"]
+        sphinx: ["~=6.0"]
         include:
         - os: macos-latest
-          python-version: 3.x
+          python-version: "3.11"
     runs-on: ${{ matrix.os }}
 
     steps: