Update CHANGELOG.md

Author: alessfg

CHANGELOG.md

@@ -25,7 +25,7 @@ BUG FIXES:
 
 TESTS:
 
-* Update GitHub actions to run on Ubuntu 22.04.
+* Update GitHub actions to run on Ubuntu 22.04. Amazon Linux 2 does not support cgroups v2 so the corresponding Molecule tests have been removed.
 * Update GitHub actions to only skip \*plus\* scenarios when the NGINX Plus license secrets are not present (it used to only run the NGINX Plus test scenarios during internal PRs).
 * Add SLES 15 to all Molecule tests.
 * Create downgrade and upgrade tests for NGINX Plus.