CompatHelper: bump compat for NonlinearSolve to 4 for package docs, (keep existing compat)

Author: CompatHelper Julia

docs/Project.toml

@@ -77,7 +77,7 @@ MethodOfLines = "0.11"
 ModelingToolkit = "9.9"
 MultiDocumenter = "0.7"
 NeuralPDE = "5.15"
-NonlinearSolve = "3"
+NonlinearSolve = "3, 4"
 Optimization = "4"
 OptimizationMOI = "0.5"
 OptimizationNLopt = "0.3"