BLD: simplify Cython requirement to always >=0.25.35

Author: rgommers

pyproject.toml

@@ -8,9 +8,7 @@
 build-backend = "mesonpy"
 requires = [
     "meson-python>=0.14.0",
-    # when updating Cython version, also update check in meson.build
-    "Cython>=0.29.35,<3.0; python_version>='3.12' and platform_system=='Windows'",
-    "Cython>=0.29.35; python_version<'3.12' or platform_system!='Windows'",
+    "Cython>=0.29.35",
 
     # When numpy 2.0.0rc1 comes out, we should update this to build against 2.0,
     # and then runtime depend on the range 1.22.X to <2.3. No need to switch to