VersionAlert for Unity

[SPLB-374] Fixed a bug where spline tool shortcuts would be active in the Scene view even when outside the context of the spline tools.
[SPLB-370] Fixed incorrect tangent values when using `SplineUtility.FitSplineToPoints`.
[SPLB-365] `EditorSplineUtility.SetKnotPlacementTool` correctly assigns the create spline tool.
[SPLB-364] Fixed null reference & lockup when instantiating children of SplineInstantiate component, when components gameobject is a prefab instance.
[UUM-131876] Fixed a memory leak introduced in 2.8.2 that occurred when a Spline became dirty.
[UUM-132208] Fixed a crash that occurred when a Prefab Variant asset was used with a SplineInstantiate component.
[UUM-133630] Fixed the help icon for splines components (SplineAnimate, SplineContainer, SplineExtrude, SplineInstantiate) pointing to the wrong documentation link. It now points to https://docs.unity3d.com/Packages/com.unity.splines@latest.

[UUM-132118] Replaced internal use of InstanceIDs with the new EntityId (Unity 6.4+).

com.unity.splines 2.8.3