Update TulipaEnergyModel requirement from 0.19 to 0.19, 0.20 in /test (#49)

Updates the requirements on [TulipaEnergyModel](https://github.com/TulipaEnergy/TulipaEnergyModel.jl) to permit the latest version.
- [Release notes](https://github.com/TulipaEnergy/TulipaEnergyModel.jl/releases)
- [Commits](TulipaEnergy/TulipaEnergyModel.jl@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: TulipaEnergyModel
  dependency-version: 0.20.0
  dependency-type: direct:production
...

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test/Project.toml

@@ -23,5 +23,5 @@ JuMP = "1"
 TOML = "1"
 TestItemRunner = "1"
 TulipaClustering = "0.5"
-TulipaEnergyModel = "0.19"
+TulipaEnergyModel = "0.19, 0.20"
 XLSX = "0.10"