Bump version of ring dependency + loosen dependency requirements

[DragonDev1906]

See #5
@michaelsproul

I've also checked compatibility with the following and loosened the restrictions on the other dependencies (except for wasm-bindgen):

cargo +nightly -Z minimal-versions update && cargo test
# Or this where the above didn't work due to transitive dependencies
cargo +nightly -Z direct-minimal-versions update && cargo test

It should also be possible to use ring = ">= 0.16, < 1.18", which wouldn't force a breaking change as far as I can tell, though due to this recommendation in https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#multiple-version-requirements I'm not sure if that's a good idea.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c04d683) 55.07% compared to head (863fe20) 52.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   55.07%   52.17%   -2.90%     
==========================================
  Files           1        1              
  Lines          69       69              
==========================================
- Hits           38       36       -2     
- Misses         31       33       +2     

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