fix: update dependencies, fix go vet issues

[danielgtaylor]

This updates dependencies and fixes any linter issues found in the codebase.

[codecov]

Codecov Report

Merging #135 (d603a3c) into main (0dac2b1) will increase coverage by 0.38%.
The diff coverage is 67.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
+ Coverage   64.26%   64.65%   +0.38%     
==========================================
  Files          21       22       +1     
  Lines        2292     2405     +113     
==========================================
+ Hits         1473     1555      +82     
- Misses        661      685      +24     
- Partials      158      165       +7     

Impacted Files	Coverage Δ
cli/formatter.go	59.15% <0.00%> (-0.28%)	⬇️
cli/transport.go	90.90% <0.00%> (ø)
openapi/example.go	0.00% <0.00%> (ø)
cli/api.go	49.58% <45.45%> (ø)
cli/apiconfig.go	61.90% <50.00%> (ø)
cli/cli.go	71.42% <50.00%> (ø)
cli/lexer.go	71.96% <72.38%> (ø)
cli/request.go	57.65% <84.00%> (+2.55%)	⬆️
cli/encoding.go	77.77% <100.00%> (ø)
cli/input.go	66.66% <100.00%> (ø)
... and 3 more

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