Update CI configs to v0.4.21

[pionbot]

Update lint scripts and CI configs.

[codecov]

Codecov Report

Merging #140 (d742461) into master (73e8a03) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   75.46%   75.46%           
=======================================
  Files          16       16           
  Lines         754      754           
=======================================
  Hits          569      569           
  Misses        103      103           
  Partials       82       82           

Flag	Coverage Δ
go	75.46% <ø> (ø)
wasm	74.93% <ø> (ø)

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