Document #4686 in release notes

Author: marcphilipp

documentation/src/docs/asciidoc/release-notes/release-notes-5.13.3.adoc

@@ -22,6 +22,8 @@ No changes.
 [[release-notes-5.13.3-junit-jupiter-bug-fixes]]
 ==== Bug Fixes
 
+* Fix regression that caused top-level and static member classes annotated with `@Nested`
+  to no longer be executed because they caused a discovery issue to be reported.
 * Stop reporting discovery issues for composed annotation classes that are meta-annotated
   with `@Nested`.
 * Stop reporting discovery issues for `DefaultImpls` classes generated by the Kotlin