Update dependency react-syntax-highlighter to v15.6.1

This MR contains the following updates:

Package	Type	Update	Change
react-syntax-highlighter	dependencies	minor	15.5.0 -> 15.6.1
@types/react-syntax-highlighter (source)	dependencies	patch	15.5.5 -> 15.5.13

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Release Notes

react-syntax-highlighter/react-syntax-highlighter (react-syntax-highlighter)

v15.6.1

Compare Source

• Fix: Allow override of display: styles when wrapLongLines is true

v15.6.0

Compare Source

• Fix: #​561 Fix bug with wrapLines that butchers highlighting
• Docs: #​559 Adding languages
• Feat: #​555 Add Vue language support
• Feat: #​534 Add a11yOneLight theme

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