Remove Python 3.9 from CI test matrix

Python 3.9 is no longer available in the CI environment. Updated the workflow to test against Python 3.10, 3.11, 3.12, and 3.13.

Author: Kani999

.github/workflows/run_tests.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v2