chore: add unreleased changelog entry for CI endpoint allowlist

Signed-off-by: cheese-cakee <farzanaman99@gmail.com>

Author: cheese-cakee

CHANGELOG.md

@@ -16,6 +16,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 ### Docs
 
 ### .github
+- Allowed `mirror.servaxnet.com:443` in `pr-check-test.yml` Harden-Runner allowlist for stable Kind download network egress.
 
 
 ## [0.2.1] - 2026-03-05