fix test

Author: jClugstor

lib/BracketingNonlinearSolve/test/adjoint_tests.jl

@@ -12,7 +12,7 @@
 
     p = [2.0, 2.0]
 
-    ∂p_zygote = Zygote.gradient(solve_nlprob, p)
+    ∂p_zygote = only(Zygote.gradient(solve_nlprob, p))
     ∂p_forwarddiff = ForwardDiff.gradient(solve_nlprob, p)
     @test ∂p_zygote ≈ ∂p_forwarddiff
 end