fixed python versions in yaml

.github/workflows/python-tests.yml

@@ -14,7 +14,7 @@ jobs:
     
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9, 3.10, 3.11, 3.12]
+        python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:

setup.py

@@ -37,5 +37,5 @@ setuptools.setup(
             'metrix++ = metrixpp.metrixpp:start'
         ]
     },
-    python_requires='>=3.5',
+    python_requires='>=3.7',
 )