Do away with draining, discard error if write fails

[lestrrat]

On second thought this is way more efficient than queuing up errors.

[codecov-commenter]

Codecov Report

Merging #423 (48c0d53) into main (c76a3f5) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #423      +/-   ##
==========================================
+ Coverage   69.90%   69.93%   +0.03%     
==========================================
  Files          80       80              
  Lines        9250     9238      -12     
==========================================
- Hits         6466     6461       -5     
+ Misses       1930     1924       -6     
+ Partials      854      853       -1     

Impacted Files	Coverage Δ
jwk/refresh.go	77.73% <100.00%> (+0.53%)	⬆️
jwk/jwk.go	59.94% <0.00%> (+0.86%)	⬆️

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