Changelog entry for Free Context in test_suite_aes fix

Signed-off-by: Joe Subbiani <joe.subbiani@arm.com>
diff --git a/ChangeLog.d/issue4176.txt b/ChangeLog.d/issue4176.txt
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+Bugfix

+   * Fix an issue where resource is never freed when running one particular test suite with an alternative AES implementation

+Fixes #4176
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