Prepare 4.0.2 release notes

To trigger full pipeline runs, the release
is not out and as of right now,
#12339 is not yet resolved.

release-notes/4.0.2.md

@@ -0,0 +1,42 @@
+## RabbitMQ 4.0.2
+
+RabbitMQ `4.0.2` is a maintenance release in the `4.0.x` [release series](https://www.rabbitmq.com/release-information).
+
+Starting June 1st, 2024, community support for this series will only be provided to [regularly contributing users](https://github.com/rabbitmq/rabbitmq-server/blob/main/COMMUNITY_SUPPORT.md) and those
+who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
+
+Please refer to the upgrade section from the [4.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.0.1)
+if upgrading from a version prior to 4.0.
+
+This release requires Erlang 26 and supports Erlang versions up to `26.2.x`.
+[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/docs/which-erlang) has more details on
+Erlang version requirements for RabbitMQ.
+
+
+### Minimum Supported Erlang Version
+
+As of 4.0, RabbitMQ requires Erlang 26. Nodes **will fail to start** on older Erlang releases.
+
+
+## Changes Worth Mentioning
+
+Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v4.0.x/release-notes).
+
+
+### Generic Binary Build
+
+#### Bug Fixes
+
+ * Generic binary build packages used an incorrect version (`4.0.0+2` instead of `4.0.1`) at build time
+
+   GitHub issue: [#12339](https://github.com/rabbitmq/rabbitmq-server/issues/12339)
+
+
+### Dependency Changes
+
+None in this release.
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.2.tar.xz`
+instead of the source tarball produced by GitHub.