Update Stapler from 1.253 to 1.254 to make the form that shows up when a URL requiring POST is accessed using a different HTTP verb work with CSRF protection enabled.
(issue 34254, Stapler changelog)
Do not downgrade detached plugins when upgrading Jenkins while its previous version was not properly recorded.
(issue 48899)
The setup wizard is now resumed upon restart if it hasn't been completed yet, instead of showing the regular login screen. (regression in 2.81)
(issue 47439)
Reduce memory usage when scheduling pipelines on big clusters.
(issue 48348)
Improve UI performance with long list of running builds by caching the estimated duration.
(issue 48350)