[stubsabot] Mark caldav as obsolete since 1.4.0 (#12957)

Author: github-actions[bot]

stubs/caldav/METADATA.toml

@@ -3,6 +3,7 @@ upstream_repository = "https://github.com/python-caldav/caldav"
 # also types-lxml and types-icalendar when those stubs are added
 requires = ["types-requests", "types-vobject"]
 partial_stub = true
+obsolete_since = "1.4.0" # Released on 2024-11-05
 
 [tool.stubtest]
 ignore_missing_stub = true