2.325

This is an automatically generated changelog draft for Jenkins weekly releases.
See https://www.jenkins.io/changelog/ for the official changelogs.

🚀 New features and improvements

• Use update site provided file size for better guessing (#6038) @daniel-beck
• Modernise the appearance of the plugin manager (#5916) @janfaracik

🐛 Bug fixes

• Release detached plugin class loaders on shutdown (#6034) @basil
• Release class loader when a plugin fails to load (#6030) @basil
• JENKINS-65084 - fix filter for unavailable updates #Hacktoberfest (#5794) @Pldi23
• CallableRejectionConfig just threw an error rather than persisting anything (#5888) @jglick
• RingBufferLogHandler.records could leak records (#6018) @jglick
• JENKINS-21224 - Cannot use Listeners.notify in ItemListener.fireOnCreated due to matrix-auth tricks (#6040) @jglick

👷 Changes for plugin developers

• Improve FilePath API and Javadoc around validation (#6033) @daniel-beck
• URLClassLoader support for PluginFirstClassLoader (#5970) @basil

All contributors: @Pldi23, @basil, @daniel-beck, @dependabot, @dependabot[bot], @janfaracik, @jenkins-release-bot, @jglick and @timja