Update Debian "bookworm" to 20250520 snapshot in Docker image

docker/coturn/CHANGELOG.md

@@ -9,7 +9,7 @@ Coturn TURN server Docker image changelog
 
 ### Security updated
 
-- [Debian Linux] "bookworm" 20250428 (12.10): <https://github.com/docker-library/official-images/commit/e36248008ab07678097f211f0fb0656d37f60c80>
+- [Debian Linux] "bookworm" 20250520 (12.11): <https://github.com/docker-library/official-images/commit/6d7afdaec5dec1a0b4021b4e470853c3e9fba2bc>