chore: bump version to 2.0.6

update changelog to 2.0.6

Author: wjyrich

debian/changelog

@@ -1,3 +1,9 @@
+dde-tray-loader (2.0.6) unstable; urgency=medium
+
+  * Release 2.0.6
+
+ -- WuJiangYu <wujiangyu@uniontech.com>  Mon, 04 Aug 2025 16:35:31 +0800
+
 dde-tray-loader (2.0.5) unstable; urgency=medium
 
   * fix: correct popup position calculation in widget plugin