fix python 3.7 tests on macos

Author: maxtepkeev

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', 'pypy3.7', 'pypy3.8', 'pypy3.9', 'pypy3.10']
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-13, windows-latest]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}