fix(ci): use a version of the action that does not error

See jitterbit/get-changed-files#19 (comment) for details.

.github/workflows/add_ported_warnings.yml

@@ -22,7 +22,7 @@ jobs:
       # TODO: is this really faster than just calling git from python?
       - name: Get changed files
         id: changed-files
-        uses: jitterbit/get-changed-files@v1
+        uses: Ana06/get-changed-files@v1.2
 
       - name: run the script
         run: |