docs: update version support now that Mongoose 6 is past its legacy support date

Author: vkarpov15

docs/version-support.md

@@ -5,17 +5,11 @@ We ship all new bug fixes and features to 7.x.
 
 ## Mongoose 6
 
-Mongoose 6.x (released August 24, 2021) is currently in legacy support.
-We will continue to ship bug fixes to Mongoose 6 until August 24, 2023.
-After August 24, 2023, we will only ship security fixes, and backport requested fixes to Mongoose 6.
+Mongoose 6.x (released August 24, 2021) is currently only receiving security fixes and requested bug fixes as of August 24, 2023.
 Please open a [bug report on GitHub](https://github.com/Automattic/mongoose/issues/new?assignees=&labels=&template=bug.yml) to request backporting a fix to Mongoose 6.
 
-We are **not** actively backporting any new features from Mongoose 7 into Mongoose 6.
-Until August 24, 2023, we will backport requested features into Mongoose 6; please open a [feature request on GitHub](https://github.com/Automattic/mongoose/issues/new?assignees=&labels=enhancement%2Cnew+feature&template=feature.yml) to request backporting a feature into Mongoose 6.
-After August 24, 2023, we will not backport any new features into Mongoose 6.
-
 We do not currently have a formal end of life (EOL) date for Mongoose 6.
-However, we will not end support for Mongoose 6 until at least January 1, 2024.
+However, we will not end support for Mongoose 6 until at least April 1, 2024.
 
 ## Mongoose 5