Update changelog for #513

Author: Vlatombe

CHANGELOG.md

@@ -15,6 +15,7 @@ Unreleased
   * variant 1.2 [#464](https://github.com/jenkinsci/kubernetes-plugin/pull/464)
   * cloudbees-folder 6.8 [#471](https://github.com/jenkinsci/kubernetes-plugin/pull/471)
   * credentials 2.2.0 / ssh-credentials 1.17 [#499](https://github.com/jenkinsci/kubernetes-plugin/pull/499)
+* Making ContainerExecProc periodically send a newline to keep a socket alive [#513](https://github.com/jenkinsci/kubernetes-plugin/pull/513)[JENKINS-58065](https://issues.jenkins-ci.org/browse/JENKINS-58065)
 
 1.16.0
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