Update dependency highlight.js to ^9.15.6

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
highlight.js	dependencies	minor	^9.15.6	homepage, source

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Release Notes

highlightjs/highlight.js

v9.15.6

Compare Source

New languages: none. New styles: none. Improvements:

• Move dependencies to be devDependencies.
• Fixed security issues in dev dependencies.

v9.15.5

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New languages: none. New styles: none. Improvements: 🔥 Hot fix: updated build tool.

v9.15.2

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New languages: none. New styles: none. Improvements: 🔥 Hot fix that was preventing highlight.js from installing.

v9.15.1

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New languages: none.

New styles: none.

Improvements:

• Pony: Fixed keywords without spaces at line ends, highlighting of iso in class definitions, and function heads without bodies in traits and interfaces. Removed FUNCTION and CLASS modes until they are found to be needed and to provide some of the fixes.
• Support external language files in minified version of highlight.js (#​1888)

v9.14.2

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New languages: none. New styles: none. Improvements:

• Gauss fixed to stop global namespace pollution Scott Hyndman.
• fix(Tcl): removed apostrophe string delimiters (don't exist)

v9.14.1

Compare Source

New languages: none. New styles: none. Improvements:

• Pony: language improvements (#​1958)

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