Update gatsby in /docs from 1.9.142 to 1.9.143

[dependencies]

Dependencies.io has updated gatsby (a npm dependency in /docs) from "1.9.142" to "1.9.143".

1.9.143

No content found. Please open an issue at https://github.com/dependencies-io/support if you think this content could have been found.

[codecov]

Codecov Report

Merging #2521 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2521   +/-   ##
=======================================
  Coverage   16.87%   16.87%           
=======================================
  Files         307      307           
  Lines        7792     7792           
  Branches      773      785   +12     
=======================================
  Hits         1315     1315           
+ Misses       5871     5849   -22     
- Partials      606      628   +22

Impacted Files	Coverage Δ
...ents/src/manager/components/CommentsPanel/index.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Button.js	11.9% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-start.js	0% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
...b/ui/src/modules/ui/components/down_panel/index.js	34.78% <0%> (ø)	⬆️
app/react/src/demo/Button.js	0% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_keyevents.js	33.33% <0%> (ø)	⬆️
... and 38 more

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