chore: update changelog

Release 5.6.28.

debian/changelog

@@ -1,3 +1,12 @@
+dtkgui (5.6.28) unstable; urgency=medium
+
+  * chore: insert to cache when icon is not null
+  * chore: add flag to disable noncache flag
+  * fix: missing initialization for baseFont of fontManager(Issue: https://github.com/linuxdeepin/developer-center/issues/8040)
+  * feat: dci-icon-theme support multiple icon size
+
+ -- Deepin Packages Builder <[email protected]>  Mon, 29 Apr 2024 08:23:44 +0000
+
 dtkgui (5.6.27) unstable; urgency=medium
 
   * fix: setWindowBlurAreaByWM only work once in qt6