chore: bump version to 2.0.50 update changelog

as title

Log: as title

Author: caixr23

debian/changelog

@@ -1,3 +1,10 @@
+dde-network-core (2.0.50) unstable; urgency=medium
+
+  * fix: Record the last proxy method
+  * fix: Modifying network connection issue without automatic creation
+
+ -- caixiangrong <caixiangrong@uniontech.com>  Fri, 14 Mar 2025 10:02:20 +0800
+
 dde-network-core (2.0.49) unstable; urgency=medium
 
   * fix: Modify the proxy switch associated variable