Updating for Drone CI

.drone.yml

@@ -3,13 +3,8 @@ type: docker
 name: CI Test Pipeline
 
 steps:
-- name: greeting
-  image: alpine
-  commands:
-  - echo "Welcome to drone\n"
-
 - name: Unit Tests
-  image: python:3.11-bullseye
+  image: python:3.11-bookworm
   commands:
     - bash -c './scripts/run_unit_tests.sh'