Version 3.23.3

This bumps the CMake version to 3.23.3.

Due to libuv incompatibility with RHEL 5, support has been dropped for manylinux1. This version of CMake only provides manylinux2010 wheels. If you need manylinux1 support, you might want to pin cmake<3.23 until you can drop support. Since manylinux1 hit EOL six months ago and will stop being updated as soon as something breaks, you might want to consider moving to something newer, like manylinux2014. Pip 9, default on RHEL 7 and Ubuntu 18.04, is the main issue holding users back, so dropping Python <3.7 can reduce the damage if you also drop manylinux1.

Manylinux2010, based on the EoL CentOS 6 platform, is going to be discontinued tomorrow, so a future version of cmake will move to manylinux2014 (based on CentOS 7). Pip 19.0+ is required for manylinux2010 and pip 19.3+ is required for manylinux2014.