removing unsupported python versions

Author: chinacat567

.github/workflows/run_unit_tests.yml

@@ -12,12 +12,10 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [
-          "3.7",
-          "3.8",
           "3.9",
           "3.10",
           "3.11",