fix(dependencies): update dependency github-slugger to ^1.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github-slugger	^1.3.0 -> ^1.4.0

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Release Notes

Flet/github-slugger

### [`v1.4.0`](https://togithub.com/Flet/github-slugger/blob/master/CHANGELOG.md#​140-2021-08-24) [Compare Source](https://togithub.com/Flet/github-slugger/compare/v1.3.0...v1.4.0) - Fix to match GitHub’s algorithm on unicode

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[codecov-commenter]

Codecov Report

Merging #993 (a72887d) into master (84ef23e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #993   +/-   ##
=======================================
  Coverage   88.33%   88.33%           
=======================================
  Files          80       80           
  Lines        7594     7594           
  Branches     2427     2427           
=======================================
  Hits         6708     6708           
  Misses        860      860           
  Partials       26       26           

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[stencila-ci]

:tada: This PR is included in version 0.119.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v0.119.1

Your semantic-release bot :package::rocket: