backend/s3: add changelog entry

Author: jar-b

CHANGELOG.md

@@ -5,6 +5,7 @@ BUG FIXES:
 - config: `templatefile` would panic if given and entirely unknown map of variables [GH-36118]
 - config: `templatefile` would panic if the variables map contains marked values [GH-36127]
 - config: Remove constraint that an expanded resource block must only be used in conjunction with imports using `for_each` [GH-36119]
+- backend/s3: Lock files could not be written to buckets with object locking enabled [GH-36120]
 
 ## 1.10.0 (November 27, 2024)