fix(deps): update dependency gatsby-source-filesystem to v2.4.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby-source-filesystem	dependencies	patch	2.4.1 -> 2.4.2

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Release Notes

gatsbyjs/gatsby

### [`v2.4.2`](https://togithub.com/gatsbyjs/gatsby/compare/cfc6413b067643f402b3dca0b2af3aca9d2324a2...10722585e3544fd7672c6a262198461a6968b0eb) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/077b67fa366eb5c5e0171e87eec8c8810d44c0d5...30dad2b19e0989e3b6b2dfd3388fa10ce8f88de5)

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[codecov-io]

Codecov Report

Merging #1152 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1152   +/-   ##
=======================================
  Coverage   75.25%   75.25%           
=======================================
  Files          15       15           
  Lines         295      295           
  Branches       80       80           
=======================================
  Hits          222      222           
  Misses         68       68           
  Partials        5        5           

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