Backport PR #568 on branch 3.x (PR: Update Changelog for 3.1.1) (#569)

Author: meeseeksmachine

CHANGELOG.md

@@ -1,5 +1,15 @@
 # History of changes
 
+## Version 3.1.1 (2025/10/17)
+
+### Pull Requests Merged
+
+* [PR 566](https://github.com/spyder-ide/spyder-kernels/pull/566) - PR: Fix getting Pixi environment info on Posix systems, by [@ccordoba12](https://github.com/ccordoba12)
+
+In this release 1 pull request was closed.
+
+----
+
 ## Version 3.1.0 (2025/10/01)
 
 ### New features