Raise downgrade compat floors (#4728)

Align the root test-environment floors with the local ModelingToolkitBase subpackage so downgrade tests do not min-resolve SciMLBase and OrdinaryDiffEqCore below the versions required by the in-tree subpackage.

Co-authored-by: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>

Author: ChrisRackauckas-Claude

Project.toml

@@ -98,7 +98,7 @@ OptimizationOptimJL = "0.4.11"
 OrderedCollections = "1, 2"
 OrdinaryDiffEq = "6.82.0, 7"
 OrdinaryDiffEqBDF = "1, 2"
-OrdinaryDiffEqCore = "1.34.0, 2, 3.32.0, 4"
+OrdinaryDiffEqCore = "1.34.0, 2, 3.32.0, 4.4"
 OrdinaryDiffEqDefault = "1.2, 2"
 OrdinaryDiffEqFIRK = "1, 2"
 OrdinaryDiffEqFunctionMap = "1, 2"
@@ -111,7 +111,7 @@ REPL = "1"
 Reexport = "0.2, 1"
 RuntimeGeneratedFunctions = "0.5.12"
 SCCNonlinearSolve = "1.13"
-SciMLBase = "3"
+SciMLBase = "3.19"
 SciMLPublic = "1.0.0"
 Serialization = "1"
 Setfield = "0.7, 0.8, 1"