docs: Mention vite upgrade

Author: Danielku15

docs/releases/release1_4.mdx

@@ -486,4 +486,9 @@ There was a problem fixed that bends were not working when applied to tied notes
 https://github.com/CoderLine/alphaTab/pull/1905
 
 Before this change clefs had to be specified on every single bar because alphaTab used some defaults on new bars. 
-With this change alphaTab takes over the clef from previous bars.
+With this change alphaTab takes over the clef from previous bars.
+
+#### bundler: Vite upgraded to v6
+https://github.com/CoderLine/alphaTab/pull/1913
+
+The Vite bundler plugin was upgraded from v5 to v6.