Remove need for looseversion

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=42", "wheel", "setuptools_scm[toml]>=3.5.0", "pybind11>=2.10.0", "looseversion"]
+requires = ["setuptools>=42", "wheel", "setuptools_scm[toml]>=3.5.0", "pybind11>=2.10.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]

setup.py

@@ -9,7 +9,6 @@
 from setuptools.command.build import build
 from setuptools.command.build_ext import build_ext
 from setuptools.command.install import install
-from looseversion import LooseVersion
 
 BUILD_HOOKS = []
 INSTALL_HOOKS = []
@@ -101,13 +100,6 @@ def run(self):
                 + ", ".join(e.name for e in self.extensions)
             )
 
-        if platform.system() == "Windows":
-            cmake_version = LooseVersion(
-                re.search(r"version\s*([\d.]+)", out.decode()).group(1)
-            )
-            if cmake_version < "3.1.0":
-                raise RuntimeError("CMake >= 3.1.0 is required on Windows")
-
         for ext in self.extensions:
             self.build_extension(ext)