Prep for 3.12.2 release

Prep for 3.11.4 release

Update to use GHA CI for releasing

Prep for 3.10.6 release

More missing cstdint headers

Closes libgeos#990, References libgeos#743

Release 3.8.4 - final for 3.8 series

Add some missing note items. Revise release instructions

Prep for 3.11.3 release

Version number / news for release 3.12

3.12.0beta2 release

Prep 3.12.0beta1