Create 3.14t wheels by default

[ngoldbaum]

Over in gcanat/video_reader-rs#70 I noticed that video_reader-rs wasn't uploading cp314t wheels.

It looks like they're using a vanilla version of the action with no customization about building an explicit python version:

https://github.com/gcanat/video_reader-rs/blob/da2c7c905bdf324a9dca332060e410188f9eca39/.github/workflows/build.yml#L52-L63

That makes me suspect this is coming down to the defaults in maturin-action. Is that the case?