Update 4.5.1 release notes

Author: callumalpass

docs/releases/4.5.1.md

@@ -2,5 +2,7 @@
 
 ## Fixed
 
+- (#1672) Fixed custom date ranges in the MCP time summary tool so `from` and `to` dates work as expected
+  - Thanks to @pib for the fix
 - (#1742) Fixed calendar week and day views so the time scale stays aligned on the left instead of drifting inward
   - Thanks to @ysafonov for the report and screenshot