Update dev dependencies and lockfiles

[alangpierce]

Upgrade eslint, typescript, etc and make some code adjustments accordingly.

[github-actions]

Benchmark results

Before this PR: 373.9 thousand lines per second
After this PR: 375.1 thousand lines per second

Measured change: 0.33% faster (0.11% faster to 0.54% faster)
Summary: Probably faster

[codecov]

Codecov Report

Merging #799 (239e97a) into main (02dfb79) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #799   +/-   ##
=======================================
  Coverage   88.48%   88.48%           
=======================================
  Files          55       55           
  Lines        6028     6028           
  Branches     1429     1429           
=======================================
  Hits         5334     5334           
  Misses        424      424           
  Partials      270      270           

Impacted Files	Coverage Δ
src/parser/plugins/flow.ts	65.77% <ø> (ø)
src/parser/plugins/typescript.ts	90.57% <ø> (ø)
src/transformers/CJSImportTransformer.ts	89.59% <ø> (ø)
src/transformers/ESMImportTransformer.ts	95.15% <ø> (ø)
src/TokenProcessor.ts	95.38% <100.00%> (ø)
src/index.ts	92.15% <100.00%> (ø)
src/parser/tokenizer/index.ts	86.37% <100.00%> (ø)
src/parser/tokenizer/state.ts	100.00% <100.00%> (ø)
src/parser/traverser/statement.ts	87.15% <100.00%> (ø)
src/parser/traverser/util.ts	90.19% <100.00%> (ø)
... and 2 more

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