package.json: pin @babel/core to less than 7.12.10

[DeeDeeG]

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Description of the Change

Restrict the @babel/core indirect dependency by pinning it to below 7.12.10. (Because 7.12.10 is incompatible with this package.)

Screenshot or Gif

N/A

Applicable Issues

Workaround for #2620

[DeeDeeG]

@smashwilson this PR (or a similar intervention) fixes two things:

• Atom master branch currently can't load the github package in --dev mode. (Because Atom's main package-lock.json resolved the incompatible version of @babel/core as a dependency).
• Atom currently can't load the github package installed via apm install atom/github. (Because apm install atom/github currently downloads the incompatible version of @babel/core as a dependency.)

By the way (steps to fully land this fix):

• This can pretty easily be fixed at the Atom repo by manually editing Atom's package-lock.json to resolve @babel/core to an older version, say 7.12.9. So there's no need to necessarily cut a new release of the github package. And it can be fixed at the Atom repo without this PR being merged, actually.
• Merging this PR would fix apm install atom/github though.

[codecov]

Codecov Report

Merging #2621 (fb51a20) into master (6ab7dd6) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2621      +/-   ##
==========================================
- Coverage   93.46%   93.45%   -0.01%     
==========================================
  Files         237      237              
  Lines       13234    13234              
  Branches     1906     1906              
==========================================
- Hits        12369    12368       -1     
- Misses        865      866       +1     

Impacted Files	Coverage Δ
lib/atom/gutter.js	90.47% <0.00%> (-2.39%)	⬇️

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[smashwilson]

• Merging this PR would fix apm install atom/github though.

Definitely worth doing 👍🏻

Thanks!

[DeeDeeG]

Thanks for the merge!