See full changelist in the included readme or on the github repo: https://github.com/ValveSoftware/steamvr_unity_plugin/blob/master/Assets/SteamVR/readme.txt

Changes for 2.8.0

Updating OpenVR sdk to 2.0.10
Added knee, elbow, ankle, and wrist input sources.
Updated urls to sidestep log spam in Unity 2022
Fixed compiler errors in some plugin update scenarios.
Fixed the interaction system not being able to create interactables at runtime
Fixed reimports erasing openvr settings on some machines
Fixed the interaction system not respecting the hand clearance mask
Fixed the interaction system teleport example not working while using the 2d fallback
Fixed RemoveAllListeners not removing all listeners
Various performance and garbage collection fixes
Fix for multipass breaking under scriptable render pipelines.
Fix for unnecessary preinit that was breaking some startup scenarios
Fix for incorrect reporting of eye position
Fix for broken depth textures in some situations
Fixed some scenarios where OpenGL wouldn't work.
Fix for projects that use binary serialization. (Settings file gets output on build now)
Better support for unicode app names and keys
Fix for some projects in linux not loading manifests properly.
Fixed a localization issue preventing some projects with unicode characters in the path from working.
Fixed the interaction system not handling the bow and arrow correctly under newer physics simulations
Fixed the interaction system not dismissing grip hints correctly

SteamVR Plugin