Update COMMUNITY_SUPPORT.md

Change 3.13.x -> 4.0.x

Author: lukebakken

COMMUNITY_SUPPORT.md

@@ -60,11 +60,11 @@ The above rules equally apply to contributions to RabbitMQ, officially supported
 
 ## Release Series Eligible for Community Support
 
-Only releases in the latest minor series of the latest major version are eligible for community support. Currently this is RabbitMQ 3.13.x in the 3.x major series.
+Only releases in the latest minor series of the latest major version are eligible for community support. Currently this is RabbitMQ 4.0.x in the 4.x major series.
 
 All patches (bug fixes and improvements alike) will only be available for the latest minor series in the latest major series. This applies to all changes contributed by the community.
 
-For example, if the latest supported series (minor) is 3.13.x, all core and community contributions will ship in a 3.13.x release until a newer minor or major comes out (say, 3.14.x or 4.0.x). 
+For example, if the latest supported series (minor) is 4.0.x, all core and community contributions will ship in a 4.0.x release until a newer minor or major comes out (say, 4.1.x). 
 
-The RabbitMQ team will not backport patches to older release series (such as 3.12.x) of open source RabbitMQ, including cases where a patch was contributed by the community.
+The RabbitMQ team will not backport patches to older release series (such as 3.13.x) of open source RabbitMQ, including cases where a patch was contributed by the community.
 Patch releases for older release series are exclusively available to users with VMware Tanzu RabbitMQ commercial licenses.