requirements: Specify exact Cython version required

Cython finally released version 3.0 on July 17 2023 after 3 years
of testing.  The new version is a major change since the last
version (0.29) and became the default version.  Since the
yappcap requirements.txt and pyproject.toml files didn't
specify an exact Cython version, we were pulling down 3.0 which
caused major compile failures.  We now lock yappcap to the exact
0.29.28 version we need.

Author: gtjoseph

Diff for: pyproject.toml

@@ -1,17 +1,17 @@
 [build-system]
-requires = ["wheel", "setuptools>=59", "Cython", "cython-setuptools" ]
+requires = ["wheel", "setuptools>=59", "Cython==0.29.28", "cython-setuptools==0.2.3" ]
 build-backend = "setuptools.build_meta"
 
 [project]
 name="yappcap"
-version="0.0.1"
+version="0.0.2"
 requires-python='>=3'
 classifiers=[  # Optional
     "Development Status :: 4 - Beta",
     'Intended Audience :: Developers',
     'Programming Language :: Python :: 3',
     ]
-dependencies = [ "Cython" ]
+dependencies = [ "Cython==0.29.28" ]
 
 [project.urls]
     "Homepage" = "https://github.com/asterisk/yappcap"

Diff for: requirements.txt

@@ -1 +1 @@
-Cython
+Cython==0.29.28