Add changelog entry

Author: EhabY

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Unreleased
 
+### Fixed
+
+- Fixed SSH config writes failing on Windows when antivirus, cloud sync software,
+  or another process briefly locks the file.
+
 ### Added
 
 - Proxy log directory now defaults to the extension's global storage when `coder.proxyLogDirectory`