As part of the process of getting a [new plugin parent POM](https://github.com/jenkinsci/plugin-pom) decouple from the core project
the plugin module is removed.

This is the logical consequence of what we agreed in the CERT meeting
today, given that the 2.53.2 is public.

(cherry picked from commit d2e0f6fa)

This is the logical consequence of what we agreed in the CERT meeting
today, given that the 2.53.2 is public.

[FIXED JENKINS-31718] Integrated a new version of Remoting with a fix for a regression in concurrent socket connections.

(cherry picked from commit e6d8500d)

In the project meeting today we decided to pull this in.

[FIXED JENKINS-31718] Integrated a new version of Remoting with a fix for a regression in concurrent socket connections.

Most of the changes are now in remoting.

(cherry picked from commit 7e053afb)