Remove obsolete 3.7 Python version from GihHub actions

Author: leszekhanusz

.github/workflows/tests.yml

@@ -8,11 +8,9 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.8"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.8"]
         os: [ubuntu-24.04, windows-latest]
         exclude:
-          - os: windows-latest
-            python-version: "3.7"
           - os: windows-latest
             python-version: "3.9"
           - os: windows-latest