Update AtomsBuilder requirement to 0.2.3 in /docs (#48)

Updates the requirements on [AtomsBuilder](https://github.com/JuliaMolSim/AtomsBuilder.jl) to permit the latest version.
- [Release notes](https://github.com/JuliaMolSim/AtomsBuilder.jl/releases)
- [Commits](JuliaMolSim/AtomsBuilder.jl@v0.0.1...v0.2.3)

---
updated-dependencies:
- dependency-name: AtomsBuilder
  dependency-version: 0.2.3
  dependency-type: direct:production
...

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docs/Project.toml

@@ -21,6 +21,7 @@ GeometryOptimization = {path = ".."}
 [compat]
 ASEconvert = "0.1.8, 0.2"
 AtomsBase = "0.5.2"
+AtomsBuilder = "0.2.3"
 DFTK = "0.7"
 Documenter = "~1.8, 1.16"
 EmpiricalPotentials = "0.2.5"