Update README build deps to cython>=3.1.0

Author: vlad-perevezentsev

README.md

@@ -151,7 +151,7 @@ If you already have `mkl` and `numpy` installed (from your system or a conda env
 and want to reuse them instead of pulling fresh copies into an isolated build, first
 install the build dependencies:
 ```sh
-pip install meson-python cmake ninja cython numpy mkl-devel
+pip install meson-python cmake ninja "cython>=3.1.0" numpy mkl-devel
 ```
 
 then build against the existing installation with: