try changing the license in pyproject

Author: RemDelaporteMathurin

pyproject.toml

@@ -12,7 +12,7 @@ name = "FESTIM"
 description = "Finite element simulations of hydrogen transport"
 readme = "README.md"
 requires-python = ">=3.9"
-license = "Apache-2.0"
+license = { text = "Apache-2.0" }
 dependencies = ["tqdm", "scifem>=0.2.13", "adios4dolfinx"]
 classifiers = [
     "Natural Language :: English",