Update OrdinaryDiffEqCore requirement from 1.30.0, 2.0 to 1.30.0, 2.0, 3.1 (#120)

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
...

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Author: dependabot[bot]

Project.toml

@@ -32,7 +32,7 @@ FiniteDiff = "2.3"
 ForwardDiff = "0.10, 1.3"
 JET = "0.9, 0.10, 0.11"
 OrdinaryDiffEq = "6"
-OrdinaryDiffEqCore = "1.30.0, 2.0"
+OrdinaryDiffEqCore = "1.30.0, 2.0, 3.1"
 OrdinaryDiffEqDifferentiation = "1.16"
 OrdinaryDiffEqRosenbrock = "1.17.0"
 RecursiveArrayTools = "1,2,3"