Merge pull request #458 from ChrisRackauckas-Claude/fix-stale-clamp-import

fix: drop stale _clamp import (un-break Blocks/math tests)

Author: ChrisRackauckas

test/Blocks/math.jl

@@ -1,7 +1,7 @@
 using ModelingToolkitStandardLibrary.Blocks
 using SciCompDSL
 using ModelingToolkit, OrdinaryDiffEq, Test
-using ModelingToolkitStandardLibrary.Blocks: _clamp, _dead_zone
+using ModelingToolkitStandardLibrary.Blocks: _dead_zone
 using ModelingToolkit: inputs, unbound_inputs, bound_inputs, t_nounits as t
 using OrdinaryDiffEq: ReturnCode.Success
 using OrdinaryDiffEqRosenbrock: Rodas4