Add 2023.12 testing to the CI

Author: asmeurer

.github/workflows/array-api-tests.yml

@@ -12,6 +12,7 @@ jobs:
       matrix:
         python-version: ['3.9', '3.10', '3.11', '3.12']
         numpy-version: ['1.26', 'dev']
+        api_version: ['2022.12', '2023.12']
         exclude:
           - python-version: '3.8'
             numpy-version: 'dev'
@@ -49,5 +50,12 @@ jobs:
         # tests fail in numpy 1.26 on bad scalar type promotion behavior)
         NPY_PROMOTION_STATE: weak
       run: |
+        export ARRAY_API_STRICT_API_VERSION=${{ matrix.api_version }}
+
+        # Only signature tests work for now for 2023.12
+        if [[ "${{ matrix.api_version }}" == "2023.12" ]]; then
+          PYTEST_ARGS="${PYTEST_ARGS} -k signature
+        fi
+
         cd ${GITHUB_WORKSPACE}/array-api-tests
         pytest array_api_tests/ --skips-file ${GITHUB_WORKSPACE}/array-api-strict/array-api-tests-xfails.txt ${PYTEST_ARGS}