Update babel monorepo

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
babel-core (source)	6.26.0 -> 6.26.3
babel-loader	7.1.2 -> 7.1.5

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Release Notes

babel/babel

v6.26.3

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Summary

• Fixed a small regression from the backport of #​7761 from #​7812 if the output file contains no JS content

v6.26.2

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Summary

• Landed #​7812 which backported several fixes to make sourcemaps behave better
  • #​7312 - Include better mappings for arrow-transformed 'this' and 'arguments'
  • #​7378 - Include better mappings for import bindings transformed to member expressions
  • #​7761 - Re-implement inputSourceMap merging logic to more accurately reflect mappings

babel/babel-loader

v7.1.5

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v7.1.5

• Perf: Use md4 instead of sha1 for filename hashes (#​638)

v7.1.4

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🐛 Bug Fix

• Update code to read filename

v7.1.3

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🐛 Bug Fix

• Support webpack 4

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[codecov-io]

Codecov Report

Merging #82 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #82   +/-   ##
=======================================
  Coverage   86.21%   86.21%           
=======================================
  Files          18       18           
  Lines         537      537           
  Branches      174      174           
=======================================
  Hits          463      463           
  Misses         64       64           
  Partials       10       10

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