Add changelog section for v2.0.563 [skip ci]

Author: PEZ

CHANGELOG.md

@@ -4,6 +4,8 @@ Changes to Calva.
 
 ## [Unreleased]
 
+## [2.0.563] - 2026-02-26
+
 - Fix: [REPL menu defaults to "Start your project" even when REPL is already running](https://github.com/BetterThanTomorrow/calva/issues/3106)
 
 ## [2.0.562] - 2026-02-25