Update cython to 3.x

Since python-yaml needs cython 0.x add a cython0 package like Arch

Rebuild everything just to be sure

python-yaml/PKGBUILD

@@ -5,7 +5,7 @@ _realname=yaml
 pkgbase=python-${_realname}
 pkgname=("python-${_realname}")
 pkgver=6.0
-pkgrel=2
+pkgrel=3
 pkgdesc='Python bindings for YAML, using fast libYAML library'
 arch=('i686' 'x86_64')
 url='https://pyyaml.org/'
@@ -14,7 +14,7 @@ depends=('python' 'libyaml')
 makedepends=(
   'python-build'
   'python-installer'
-  'cython'
+  'cython0'
   'python-setuptools'
   'python-wheel'
   'libyaml-devel'