[Snyk] Security upgrade stylelint from 15.10.1 to 16.6.1

[Romanred]

Snyk has created this PR to fix 3 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uncontrolled resource consumption SNYK-JS-BRACES-6838727	696
	Inefficient Regular Expression Complexity SNYK-JS-MICROMATCH-6838728	589
	Improper Input Validation SNYK-JS-POSTCSS-5926692	479

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🦉 Uncontrolled resource consumption
🦉 Improper Input Validation