bumps python 3.7 test to 3.7.17

3.7 is depericated and no longer in list of supprted python setup-python@v2

Author: hitime1234

.github/workflows/unittest.yaml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        py_ver: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        py_ver: ["3.7.17", "3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps: