chore: update changelog

Author: jpadilla

CHANGELOG.rst

@@ -22,7 +22,7 @@ Added
 Security
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-Prevent key confusion through non-blocklisted public key formats. https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffqj-6fqr-9h24
+- [CVE-2022-29217] Prevent key confusion through non-blocklisted public key formats. https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffqj-6fqr-9h24
 
 Changed
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