chore: update and appease linters

[mccutchen]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.53%. Comparing base (51902cc) to head (bd32dba).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   94.50%   94.53%   +0.03%     
==========================================
  Files          10       10              
  Lines        2185     2197      +12     
==========================================
+ Hits         2065     2077      +12     
  Misses         84       84              
  Partials       36       36              

Files with missing lines	Coverage Δ
httpbin/helpers.go	96.08% <100.00%> (+0.04%)	⬆️
httpbin/websocket/websocket.go	77.28% <100.00%> (ø)

... and 1 file with indirect coverage changes

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