Update dependency node-sass to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
node-sass	devDependencies	major	4.14.1 -> 5.0.0

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Release Notes

sass/node-sass

v5.0.0

Compare Source

Breaking changes

• Only support LTS and current Node versions (@​nschonni)
• Remove deprecated process.sass API (@​xzyfer, #​2986)

Features

• Add support for Node 15
• New node-gyp version that supports building with Python 3

Community

• More inclusive documentation (@​rgeerts, #​2944)
• Enabled dependabot (@​nschonni)
• Improve release automation (@​nschonni)

Fixes

• Bumped many dependencies (@​nschonni)

Supported Environments

OS	Architecture	Node
Windows	x86 & x64	10, 12, 14, 15
OSX	x64	10, 12, 14, 15
Linux*	x64	10, 12, 14, 15
Alpine Linux	x64	10, 12, 14, 15
FreeBSD	i386 amd64	10, 12, 13

*Linux support refers to major distributions like Ubuntu, and Debian

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[coveralls]

Pull Request Test Coverage Report for Build 967

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.906%

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Totals
Change from base Build 965:	0.0%
Covered Lines:	45
Relevant Lines:	53

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💛 - Coveralls