Add release note for ObjectListFilter change

Co-authored-by: xperiandri <2365592+xperiandri@users.noreply.github.com>

Author: Copilot

RELEASE_NOTES.md

@@ -288,4 +288,5 @@
 
 * **Breaking Change** Migrated to .NET 10
 * **Breaking Change** Made Relay `Edge` a read-only struct
+* Added case-insensitive string comparison support to `ObjectListFilter`, including comparer-aware filter cases and GraphQL filter suffix handling
 * Improved Relay XML documentation comments