Add Python 3.11 to Github Actions builds (#306)

* Add Python3.11 to the Github Actions, in the manylinux2014 build as well as the
packaging test.

I added a second image, x86_64, to the manylinux2014 build matrix - the i686
build didn't immediately pass, so I left it out.

* Move the bundled capnproto library forward to 0.10.3.

* Remove the 2010 build entirely, and update the 2014 build to include i686.

buildutils/bundle.py

@@ -26,7 +26,7 @@ pjoin = os.path.join
 #
 
 
-bundled_version = (0, 8, 1)
+bundled_version = (0, 10, 3)
 libcapnp_name = "capnproto-c++-%i.%i.%i.tar.gz" % (bundled_version)
 libcapnp_url = "https://capnproto.org/" + libcapnp_name