ci: drop Node.js 14 and 16 from matrix

[wellwelwel]

Context:

• ci: fix test file name #2530 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.18%. Comparing base (bd30872) to head (6a7d75b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2531      +/-   ##
==========================================
- Coverage   91.20%   91.18%   -0.02%     
==========================================
  Files          69       69              
  Lines       15547    15547              
  Branches     1330     1329       -1     
==========================================
- Hits        14179    14176       -3     
- Misses       1368     1371       +3     

Flag	Coverage Δ
compression-0	91.18% <ø> (-0.02%)	⬇️
compression-1	90.55% <ø> (-0.65%)	⬇️
tls-0	90.71% <ø> (ø)
tls-1	90.55% <ø> (-0.47%)	⬇️

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