Require Optim 2 in root tests

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

Author: ChrisRackauckas

Project.toml

@@ -45,7 +45,7 @@ LoggingExtras = "0.4, 1"
 Lux = "1.12.4"
 MLUtils = "0.4"
 ModelingToolkit = "11"
-Optim = ">= 1.4.1"
+Optim = "2"
 Optimisers = ">= 0.2.5"
 OptimizationBase = "5"
 OptimizationOptimJL = "0.4.10"