Add Codespell job to GitHub Actions and prettify yaml files

[kianmeng]

YAML files prettified by prettier -w .github/

[codecov[bot]]

Codecov Report

Merging #329 (70f657d) into main (c758b4d) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #329   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         4558      4558           
=========================================
  Hits          4558      4558           

Impacted Files	Coverage Δ
src/aioquic/quic/packet_builder.py	100.00% <ø> (ø)
src/aioquic/tls.py	100.00% <ø> (ø)

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[jlaine]

Thanks, merged!

[kianmeng]

:partying_face: :partying_face: :partying_face: :partying_face: :partying_face: