v8.13.0

ModelingToolkit v8.13.0

Diff since v8.12.0

Merged pull requests:

• Add .JuliaFormatter (#1590) (@YingboMa)
• CompatHelper: bump compat for Setfield to 1, (keep existing compat) (#1597) (@github-actions[bot])
• Make sure defaults handles differentials as well (#1598) (@YingboMa)
• Add a pass that converts unbound inputs to parameters (#1599) (@YingboMa)
• Fix minor typos (#1600) (@stillyslalom)
• Formatter CI (#1601) (@YingboMa)
• Add hessian_sparsity method for NonlinearSystem (#1602) (@Vaibhavdixit02)
• clarify connector warning (#1603) (@visr)
• CompatHelper: bump compat for DocStringExtensions to 0.9, (keep existing compat) (#1605) (@github-actions[bot])
• Pass hessian prototype to OptimizationFunction (#1606) (@Vaibhavdixit02)