Upgrade flow-bin@latest and any packages raising Flow complaints

[alxmyth]

Prepares package for [email protected] and upgrades any out-of-date packages which raise Flow errors.

See WPT Bath Runs (Flow) for more details.

[codecov]

Codecov Report

Merging #220 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #220   +/-   ##
=======================================
  Coverage   79.26%   79.26%           
=======================================
  Files          10       10           
  Lines         217      217           
  Branches       47       47           
=======================================
  Hits          172      172           
  Misses         30       30           
  Partials       15       15

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #220 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #220   +/-   ##
=======================================
  Coverage   79.26%   79.26%           
=======================================
  Files          10       10           
  Lines         217      217           
  Branches       47       47           
=======================================
  Hits          172      172           
  Misses         30       30           
  Partials       15       15

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c93dd5f...4727829. Read the comment docs.

[codecov]

Codecov Report

Merging #220 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #220   +/-   ##
=======================================
  Coverage   79.26%   79.26%           
=======================================
  Files          10       10           
  Lines         217      217           
  Branches       47       47           
=======================================
  Hits          172      172           
  Misses         30       30           
  Partials       15       15

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c93dd5f...4727829. Read the comment docs.

[alxmyth]

Merging as part of canonical PR stamp.