Update pymoose.yml

Python 3.7 reached end of life  will be removing from github action

Author: hrani

.github/workflows/pymoose.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10',3.11,3.12]
+        python-version: [3.8, 3.9, '3.10',3.11,3.12]
 
     steps:
     - uses: actions/checkout@v2