Update OrdinaryDiffEqCore requirement from 1, 2.0 to 1, 2.0, 3.1

Updates the requirements on [OrdinaryDiffEqCore](https://github.com/SciML/OrdinaryDiffEq.jl) to permit the latest version.

Updates `OrdinaryDiffEqCore` to 3.1.0
- [Release notes](https://github.com/SciML/OrdinaryDiffEq.jl/releases)
- [Commits](https://github.com/SciML/OrdinaryDiffEq.jl/commits/v3.1.0)

---
updated-dependencies:
- dependency-name: OrdinaryDiffEqCore
  dependency-version: 3.1.0
  dependency-type: direct:production
  dependency-group: all-julia-packages
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/Project.toml

@@ -75,7 +75,7 @@ Optimization = "3, 4, 5"
 OptimizationNLopt = "0.2, 0.3"
 OrdinaryDiffEq = "6.76"
 OrdinaryDiffEqBDF = "1"
-OrdinaryDiffEqCore = "1, 2.0"
+OrdinaryDiffEqCore = "1, 2.0, 3.1"
 Plots = "1"
 RecursiveArrayTools = "3"
 SDEProblemLibrary = "0.1, 1"