Bump version to 3.4.0 (#606)

* Bump version to 3.4.0

* Update release notes for 3.4.0

Author: cicalese

RELEASE_NOTES.md

@@ -24,3 +24,4 @@ Canasta version history:
 - 3.2.1 - February 24, 2026 - Update to CanastaBase 1.2.1; stabilize Canasta version tag to always point to the actual version commit; update SimpleMathJax and SubPageList extensions
 - 3.3.1 - March 1, 2026 - Show Canasta version on Special:Version
 - 3.3.2 - March 2, 2026 - Update to CanastaBase 1.3.1
+- 3.4.0 - March 4, 2026 - Version alignment with Canasta-CLI 3.4.0

VERSION

@@ -1 +1 @@
-3.3.2
+3.4.0