fix build backend

pyproject.toml

@@ -1,42 +1,6 @@
 [build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
-
-[project]
-name = "femwell"
-version = "0.0.1"
-authors = [
-    {name = "Helge Gehring"},
-]
-description = "Mode solver for photonic and electric waveguides based on FEM"
-keywords = [
-    "integrated photonics",
-    "silicon photonics",
-    "mode solving",
-    "finite element analysis"
-]
-classifiers = [
-    "Development Status :: 4 - Beta",
-    "Intended Audience :: Science/Research",
-    "Programming Language :: Python :: 3",
-    "Topic :: Scientific/Engineering"
-]
-license = {file = "LICENSE"}
-readme = "README.md"
-
-requires-python = ">=3.8"
-
-dependencies = [
-    "scikit-fem>=8.1.0",
-    "gmsh",
-    "pygmsh",
-    "matplotlib",
-    "shapely>=2.0.0"
-]
-
-[project.urls]
-Homepage = "https://github.com/HelgeGehring/femwell"
-Documentation = "https://HelgeGehring.github.io/femwell/"
+requires = ["poetry-core>=1.6.0"]
+build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "femwell"