chore(deps): update dependency gulp-stylelint to v13

[mesosphere-renovate]

This PR contains the following updates:

Package	Type	Update	Change
gulp-stylelint	devDependencies	major	3.9.0 -> 13.0.0

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Release Notes

olegskl/gulp-stylelint

v13.0.0

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Notable changes:

– Bumped stylelint peer dependency to ^13.0.0 (#​123)
– Bumped nodejs engine requirement to >=10.12.0 (#​125)

Big thanks to @​XhmikosR for making this release happen! 🙇

v11.0.0

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Notable changes:

– Bumped stylelint peer dependency to ^12.0.0

Big thanks to @​XhmikosR for making this release happen! 🙇

v10.0.0

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Notable changes:

– Bumped stylelint peer dependency to ^11.0.0
– Fixed vulnerabilities reported by github security

This release happened thanks to these awesome people: @​XhmikosR and @​perrin4869.

v9.0.0

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Notable changes:

– Bumped stylelint peer dependency to ^10.0.0
– Dropped support for Node <8.15.1

v8.0.0

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Notable changes:

– Bumped stylelint peer dependency to ^9.6.0
– Drops support for node <6 #​105
– Fix reporting for ignored files #​105

v7.0.0

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Notable changes:

• Bumped stylelint peer dependency to ^9.0.0

v6.0.0

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Notable changes:

• stylelint is now a peer dependency (^8.0.0).
• the fix option has been re-enabled
• fixed an error with empty sourcemaps

v5.0.0

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Sourcemaps are now supported.

v4.0.0

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Notable changes:

• Updated stylelint dependency to version 8.0.0. See changelog.
• Stream is not auto-resumed.

Note that this release does not support the following stylelint options:

• fix: stylelint doesn't yet support autofixing of strings
• cache: use caching on the gulp level.

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