Fix the labeler to match all Python files in docs/ directory

Now that scripts were moved to `docs/_scripts` the `labeler.yml` file
must be updated too.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/labeler.yml

@@ -45,7 +45,7 @@
   - ".editorconfig"
   - ".git*"
   - ".git*/**"
-  - "docs/*.py"
+  - "docs/**/*.py"
   - CODEOWNERS
   - MANIFEST.in
   - noxfile.py