Prepare for 4.5.0 release

Author: ancwrd1

CHANGELOG.md

@@ -1,7 +1,8 @@
-## v4.5.0 (next version)
+## v4.5.0 (2025-07-27)
 - Added a possibility to specify custom server port if it's different from 443.
 - UI labels are made selectable in the connection status dialog.
 - Added a new option `ip-lease-time`, to specify the custom IP lease time.
+- Fixed a problem with wrongly constructed keepalive packets causing DNS query delays.
 
 ## v4.4.5 (2025-07-12)
 - Added a parameter to the command line tools to generate shell autocompletions.