Changelog update - v0.8.6 (#280)

Current pull request contains patched `CHANGELOG.md` file for the
`v0.8.6` version.

Co-authored-by: GitHub Action <action@github.com>

Author: github-actions[bot]

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## 0.8.6 - 2026-03-05
+
 ### Changed
 
 - mTLS connections no longer disconnect when the certificate refresh command exits with a non-zero code