Explicitly bump istanbul to newer versions

[SimenB]

Summary
See last comments in #4519.
This is just making it explicit so deduping and upgrading doesn't leave users on old versions.

Test plan
Same versions internally in jest as before, so should be good.

[codecov-io]

Codecov Report

Merging #4616 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4616   +/-   ##
=======================================
  Coverage   56.17%   56.17%           
=======================================
  Files         194      194           
  Lines        6544     6544           
  Branches        3        3           
=======================================
  Hits         3676     3676           
  Misses       2867     2867           
  Partials        1        1

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[github-actions]

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