Ensure Python 3.7 tests are run on an older ubuntu version

Author: Cawllec

.github/workflows/python-package.yml

@@ -9,14 +9,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
         os: ['ubuntu-latest']
         include:
           - python-version: '3.5'
             os: 'ubuntu-20.04'
             pip-trusted-host: 'pypi.python.org pypi.org files.pythonhosted.org'
           - python-version: '3.6'
             os: 'ubuntu-20.04'
+          - python-version: '3.7'
+            os: 'ubuntu-22.04'
 
     steps:
     - uses: actions/checkout@v4