Upgrade to *ring* 0.17 and untrusted 0.9.

[briansmith]

untrusted 0.9 is used by ring. untrusted stopped providing a PartialEq for Input in 0.9; this was the driver for all the code changes.

[codecov[bot]]

Codecov Report

Merging #286 (948b363) into main (301128f) will decrease coverage by 0.14%. The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
- Coverage   52.08%   51.94%   -0.14%     
==========================================
  Files          20       20              
  Lines        3936     3983      +47     
==========================================
+ Hits         2050     2069      +19     
- Misses       1886     1914      +28     

Files	Coverage Δ
src/cert.rs	96.21% <100.00%> (ø)
src/signed_data.rs	100.00% <100.00%> (ø)
src/verify_cert.rs	97.17% <100.00%> (+0.02%)	:arrow_up:
src/name/verify.rs	47.64% <0.00%> (ø)
src/lib.rs	27.67% <50.00%> (+0.76%)	:arrow_up:

... and 1 file with indirect coverage changes

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[briansmith]

@cpu PTAL.