Add pystencils dependency

pyproject.toml

@@ -11,7 +11,7 @@ authors = [
 ]
 license = { file = "COPYING.txt" }
 requires-python = ">=3.10"
-dependencies = ["sympy>=1.6,<=1.11.1", "numpy>=1.8.0", "appdirs", "joblib"]
+dependencies = ["pystencils>=1.3", "sympy>=1.6,<=1.11.1", "numpy>=1.8.0", "appdirs", "joblib"]
 classifiers = [
     "Development Status :: 4 - Beta",
     "Framework :: Jupyter",