Add remark about graduation

Author: msujew

CHANGELOG.md

@@ -9,6 +9,7 @@ We maintain separate change logs for the individual packages:
 
 ## Closed Issues and PRs
 
+* [v3.3.0](https://github.com/eclipse-langium/langium/milestone/14?closed=1)
 * [v3.2.0](https://github.com/eclipse-langium/langium/milestone/13?closed=1)
 * [v3.1.0](https://github.com/eclipse-langium/langium/milestone/12?closed=1)
 * [v3.0.0](https://github.com/eclipse-langium/langium/milestone/11?closed=1)

packages/langium/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## 3.3.0 (Nov. 2024)
 
+This release marks the graduation of Langium to a mature Eclipse Foundation project.
+See the [GitLab issue](https://gitlab.eclipse.org/eclipsefdn/emo-team/emo/-/issues/810) for more information.
+
 ### General Improvements
 
 * Expose a new `LexerErrorMessageProvider` service to easily override lexer error messages ([#1716](https://github.com/eclipse-langium/langium/pull/1716)).