test: use Jest instead of AVA

[jonahsnider]

No description provided.

[codecov]

Codecov Report

Merging #377 (601af71) into master (6cb55a2) will increase coverage by 100.00%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           master      #377        +/-   ##
=============================================
+ Coverage        0   100.00%   +100.00%     
=============================================
  Files           0         4         +4     
  Lines           0       517       +517     
  Branches        0        36        +36     
=============================================
+ Hits            0       517       +517     

Impacted Files	Coverage Δ
packages/convert/packages/convert/src/converter.ts	100.00% <0.00%> (ø)
...kages/convert/packages/convert/src/convert-many.ts	100.00% <0.00%> (ø)
packages/convert/packages/convert/src/convert.ts	100.00% <0.00%> (ø)
packages/convert/packages/convert/src/ms.ts	100.00% <0.00%> (ø)

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[github-actions]

🎉 This PR is included in version 4.4.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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