This is an update for #1801, which tracked that hatch was uninstallable until the recent zstd release. Now that it's installable, we should add testing for the free-threaded build and explicit support. While we're at it, we can add support for GIL-enabled 3.14 as well.

Currently there's 3.9-3.13 testing, but no 3.13t, 3.14, or 3.14t.

For 3.14t and 3.13t, you'd have to be ok with zstandard building from source in the install of hatch. You could wait for #2034 to be merged before adding 3.13t and 3.14t to avoid that.