Update dependency babel-core to v6.26.3

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This PR contains the following updates:

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

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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

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