move to macos-14

.github/workflows/tests.yml

@@ -27,10 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04, windows-2019, macos-13]
-        # Python 3.8 is what we currently support for running cohortextractor
-        # locally, and 3.9 is what we required for databuilder so we need to make
-        # sure we can run with those
+        os: [ubuntu-20.04, ubuntu-22.04, windows-2019, macos-14]
         python: ["3.8", "3.9", "3.10"]
     runs-on: ${{ matrix.os }}
     name: Run test suite
@@ -65,7 +62,7 @@ jobs:
           just test-no-docker -vvv
 
       - name: Run actual tests on macos
-        if: ${{ matrix.os == 'macos-13' }}
+        if: ${{ matrix.os == 'macos-14' }}
         run: just test-no-docker -vvv
 
   test-package-build: