chore: bump version to 2.0.0

update changelog to 2.0.0

Author: fly602

debian/changelog

@@ -1,3 +1,9 @@
+dde-session (2.0.0) unstable; urgency=medium
+
+  * * feat: update session configuration for Deepin Desktop Environment
+
+ -- fuleyi <[email protected]>  Fri, 20 Jun 2025 16:59:39 +0800
+
 dde-session (1.99.21) unstable; urgency=medium
 
   * feat: enable position independent code in CMake