Prepare final release notes for 5.0.13 (#6847)

Author: eddyashton

Diff for: CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Memory leak during EC key creation is fixed (#6845).
 - Fixed thread-safety issues when CCF nodes attempted to contact non-TLS servers. This previously could cause errors when running SNP builds with multiple worker threads (#6836).
 - Add config option in start-network.py to choose redirection kind (#6732, #6755)
+- SNP nodes will no longer crash when run on firmware returning v3 attestations (#6841).
 
 ## [5.0.12]