* [FIXES JENKINS-42371] - Update remoting to 3.6

Fixed issues:

* [JENKINS-42371](https://issues.jenkins-ci.org/browse/JENKINS-42371) - Properly close the `URLConnection` when parsing connection arguments from the JNLP file. It was causing a descriptor leak in the case of multiple connection attempts. ([PR #152](https://github.com/jenkinsci/remoting/pull/152))

* Remoting 3.6 has been burned

(cherry picked from commit b6e4fb4b)

https://github.com/jenkinsci/remoting/edit/master/CHANGELOG.md

Fixed issues:

* [JENKINS-40710](https://issues.jenkins-ci.org/browse/JENKINS-40710) - Match headers case-insensitively in `JnlpAgentEndpointResolver` in order to be compliant with HTTP2 lower-case headers. ([PR #139](https://github.com/jenkinsci/remoting/pull/139), [PR #140](https://github.com/jenkinsci/remoting/pull/140))
* [JENKINS-41513](https://issues.jenkins-ci.org/browse/JENKINS-41513) - Prevent `NullPointerException` in `JnlpAgentEndpointResolver` when receiving a header with `null` name. ([PR #140](https://github.com/jenkinsci/remoting/pull/140))
* [JENKINS-41852](https://issues.jenkins-ci.org/browse/JENKINS-41852) - Fix exported object pinning logic to prevent release due to the integer overflow. ([PR #148](https://github.com/jenkinsci/remoting/pull/148))

Improvements:

* [JENKINS-41730](https://issues.jenkins-ci.org/browse/JENKINS-41730) - Add the new `org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver.ignoreJenkinsAgentProtocolsHeader` property, which allows specifying a custom list of supported protocols instead of the one returned by the Jenkins master. ([PR #146](https://github.com/jenkinsci/remoting/pull/146))
* Print the Filesystem Jar Cache directory location in the error message when this cache directory is not writable. ([PR #143](https://github.com/jenkinsci/remoting/pull/143))
* Replace `MimicException` with the older `ProxyException` when serializing non-serializable exceptions thrown by the remote code. ([PR #141](https://github.com/jenkinsci/remoting/pull/141))
* Use OID of the `ClassLoaderProxy` in error message when the proxy cannot be located in the export table. ([PR #147](https://github.com/jenkinsci/remoting/pull/147))

(cherry picked from commit 815da8aa)

* spelling: abstract

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This reverts commit 4c1a23d9.
No longer needed as of 2527e66d.

[SECURITY-383] Additional XStream2-specific class blacklisting

(cherry picked from commit 7c2e1b2e)

* JENKINS-25218 - Hardening of FifoBuffer operation logic. The change improves the original fix in `remoting-2.54`.
* JENKINS-39547 - Corrupt agent JAR cache causes agents to malfunction.

Improvements:

* JENKINS-40491 - Improve diagnostincs of the preliminary FifoBuffer termination.
* ProxyException now retains any suppressed exceptions.

Also update to localizer 1.24 which adds support for this.

 * Allows customization in seconds, not minutes
 * Allows customization of the ping timeout (before, you could set a
   custom interval, but the timeout would always be PingThread's 4
   minute default)

This also drops the serialVersionUID from ChannelPinger.SetUpRemotePing;
without one provided, the JVM will generate one on demand which is
sufficient for the purposes here since these are never persisted and
master & slave run the same compiled code. (And it demonstrably works
since countless other MasterToSlaveCallables fail to specify their own
custom IDs)