Update hardcoded vaadin version to 24.6.2 (#4066)

* Update hardcoded vaadin version to 24.6.2

* Update _vaadin-version.adoc

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Co-authored-by: Zhe Sun <31067185+ZheSun88@users.noreply.github.com>

Author: vaadin-bot

articles/_vaadin-version.adoc

@@ -1,4 +1,4 @@
-:vaadin-version: 24.6.1
-:vaadin-flow-version: 24.6.1
+:vaadin-version: 24.6.2
+:vaadin-flow-version: 24.6.2
 :vaadin-seven-version: 7.7.38
 :vaadin-eight-version: 8.20.0