Chore: Update dependencies.

[ryan-roemer]

This PR catches up a lot of dependencies, including a (painful) TS 3.7.4 upgrade.

• Update CI to modern nodes.
• Use source string length over size reported from Webpack stats for assessing real size of source.
• Remove *.map files from published npm package.
• Upgrade prod and dev dependencies, including TypeScript (to 3.7.4).

[codecov[bot]]

Codecov Report

Merging #127 into master will increase coverage by 1.35%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   90.58%   91.94%   +1.35%     
==========================================
  Files          15       13       -2     
  Lines         765      745      -20     
  Branches      124      123       -1     
==========================================
- Hits          693      685       -8     
+ Misses         41       25      -16     
- Partials       31       35       +4

Impacted Files	Coverage Δ
src/lib/util/dependencies.ts	95.1% <ø> (ø)	:arrow_up:
src/lib/actions.ts	66.66% <ø> (ø)	:arrow_up:
src/lib/actions/sizes.ts	100% <100%> (ø)	:arrow_up:
src/lib/util/strings.ts	100% <100%> (ø)	:arrow_up:
src/lib/actions/versions.ts	94.11% <100%> (ø)	:arrow_up:
src/lib/actions/duplicates.ts	94.66% <100%> (ø)	:arrow_up:
src/plugin/duplicates.ts	85.61% <50%> (-0.69%)	:arrow_down:
src/lib/actions/base.ts	92.45% <50%> (-0.89%)	:arrow_down:
src/lib/util/files.ts	80% <0%> (-11.31%)	:arrow_down:
... and 3 more

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[ryan-roemer]

Released in inspectpack@4.3.0