drop upper bound restriction on maturin

[justeph]

Hello,

Is there any reason to have an upper bound restriction on maturin in pyproject.toml ?

We're building and testing tlparse for riscv64 as part of a larger project where we’re trying to build and deploy the most common Python binary packages for riscv64. See https://gitlab.com/riseproject/python/wheel_builder for more info).

To build riscv64 wheels, we need at least maturin 1.7.1. Right now, we’re using maturin 1.8.1, and tlparse 0.3.39 is building and testing fine (see https://gitlab.com/riseproject/python/tlparse/-/jobs/9682558261). The only catch is that we’ve had to patch the pyproject.toml and keep that patch across versions. We usually try to avoid patching stuff to keep maintenance simple, so I was wondering if there’s any way around this restriction.