Merge pull request #804 from SciML/compathelper/new_version/2024-08-20-00-23-35-381-01533154500

CompatHelper: add new compat entry for NLPModels at version 0.21 for package docs, (keep existing compat)

Author: Vaibhavdixit02

docs/Project.toml

@@ -56,6 +56,7 @@ Juniper = "0.9"
 Manifolds = "0.9"
 Manopt = "0.4"
 ModelingToolkit = "9"
+NLPModels = "0.21"
 NLPModelsTest = "0.10"
 NLopt = "0.6, 1"
 Optimization = "3"