chore: bump version to 1.99.28

as title

Log: bump version to 1.99.28

Author: mhduiy

debian/changelog

@@ -1,3 +1,9 @@
+dde-shell (1.99.28) UNRELEASED; urgency=medium
+
+  * chore: update translation
+
+ -- zhangkun <[email protected]>  Fri, 14 Mar 2025 11:07:05 +0800
+
 dde-shell (1.99.27) UNRELEASED; urgency=medium
 
   * fix: task area might have incorrect height after resize in some cases