Run Python checks for any change including deletion

The condition for running the Python checks needs to include deletion
of Python files, not just addition or modification, because deletion
can cause failures.

.github/workflows/ci.yml

@@ -121,8 +121,7 @@ jobs:
           # The outputs will be variables named "foo_files" for a filter "foo".
           filters: |
             python:
-              - added|modified:
-                  - '**/*.py'
+              - '**/*.py'
             yaml:
               - added|modified:
                   - '**/*.yaml'