Regenerate C sources using Cython 0.29.6

Author: rmk135

docs/main/changelog.rst

@@ -13,6 +13,8 @@ Development version
  reset (thanks to `Jeroen Rietveld <https://github.com/jeroenrietveld>`_).
 - Add test for ``ThreadLocalSingleton`` provider reset functionality (thanks
  to `Jeroen Rietveld <https://github.com/jeroenrietveld>`_).
+- Regenerate C sources using Cython 0.29.6.
+
 
 3.14.4
 ------

requirements-dev.txt

@@ -1,4 +1,4 @@
-cython==0.29.2
+cython==0.29.6
 tox
 unittest2
 coverage