Fix test to properly import SciMLBase

The test item needs to explicitly use SciMLBase to access NonlinearProblem
and other types from the module.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: ChrisRackauckas

lib/SCCNonlinearSolve/test/core_tests.jl

@@ -80,6 +80,7 @@ end
     # Regression test for https://github.com/SciML/NonlinearSolve.jl/issues/758
     # SCCNonlinearProblem does not have a u0 field, so calling solve() without
     # explicit u0 should not try to access prob.u0
+    using SciMLBase
     using SCCNonlinearSolve
     import NonlinearSolve