chore: test with python3.9

Author: mkolasinski-splunk

.github/workflows/build-test-release.yaml

@@ -13,7 +13,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  PYTHON_VERSION: "3.7"
+  PYTHON_VERSION: "3.9"
   POETRY_VERSION: "1.5.1"
 
 jobs: