Update SciMLTesting QA compat

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>

Author: ChrisRackauckas

Project.toml

@@ -53,7 +53,7 @@ RecursiveArrayTools = "4.3.0, 4"
 Reexport = "1.2.2"
 SafeTestsets = "0.1"
 SciMLBase = "3.18.0, 3.1"
-SciMLTesting = "1.6"
+SciMLTesting = "2.1"
 StableRNGs = "1"
 StaticArrays = "1.9.18"
 Statistics = "1"