Update pyproject.toml

Author: pablormier

pyproject.toml

@@ -11,7 +11,7 @@ homepage = "https://github.com/MetExplore/miom/"
 include = ["LICENSE"]
 
 [tool.poetry.dependencies]
-python = ">=3.7"
+python = ">=3.9"
 numpy = "^1.26.0"
 mip = "^1.13.0"
 PICOS = {version = "^2.2.52", optional = true}