delete outdated comment

Author: cxzhong

pyproject.toml

@@ -6,7 +6,6 @@ requires = [
   'meson-python',
   # Exclude 1.12.0 because of https://github.com/sagemath/cysignals/issues/212
   'cysignals >=1.11.2, != 1.12.0',
-  # Exclude 3.0.3 because of https://github.com/cython/cython/issues/5748
   'cython >=3.1.0',
   'gmpy2 >=2.1.5',
   'jinja2',