Fix SvcParamKey::Unknown parsing

[jeff-hiner]

Addresses #1677

Unfortunately it looks like this might break Key(_) parsing if they're collections, but I'm not sure what the spec says about those necessarily being collections versus arbitrary data. If so, a separate fn parse_keys should be added to svcb.rs.

[codecov]

Codecov Report

Merging #1678 (5b845ec) into main (466f268) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1678      +/-   ##
==========================================
+ Coverage   79.85%   79.87%   +0.02%     
==========================================
  Files         183      183              
  Lines       18602    18597       -5     
==========================================
  Hits        14853    14853              
+ Misses       3749     3744       -5     

[jeff-hiner]

It looks like the cleanliness test fail is a new clippy lint from Rust 1.60

[djc]

That should be fixed if you rebase.

[jeff-hiner]

Rebased.

[bluejekyll]

These all seem reasonable. I think there's a minor potential breaking change, but it's pretty deep in the config.

[bluejekyll]

Thanks for the PR!