chore(librarian): onboard to librarian (#940)

Towards googleapis/librarian#2460

---------

Co-authored-by: ohmayr <omairn@google.com>

Author: parthea

packages/django-google-spanner/.github/.OwlBot.lock.yaml

@@ -0,0 +1,10 @@
+image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:c8612d3fffb3f6a32353b2d1abd16b61e87811866f7ec9d65b59b02eb452a620
+libraries:
+  - id: django-google-spanner
+    version: 4.0.2
+    apis: []
+    source_roots:
+      - .
+    preserve_regex: []
+    remove_regex: []
+    tag_format: v{version}

packages/django-google-spanner/.github/.OwlBot.yaml

@@ -1,5 +1,9 @@
 # Changelog
 
+[PyPI History][1]
+
+[1]: https://pypi.org/project/django-google-spanner/#history
+
 ## [4.0.2](https://github.com/googleapis/python-spanner-django/compare/v4.0.1...v4.0.2) (2025-06-05)