Update CI configs to v0.4.21

[pionbot]

Update lint scripts and CI configs.

[codecov]

Codecov Report

Merging #102 (acdce40) into master (f6cf15d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #102   +/-   ##
=======================================
  Coverage   61.46%   61.46%           
=======================================
  Files          11       11           
  Lines         968      968           
=======================================
  Hits          595      595           
  Misses        271      271           
  Partials      102      102           

Flag	Coverage Δ
go	61.46% <ø> (ø)
wasm	61.46% <ø> (ø)

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