chore(deps): update dependency postcss-inline-svg to v6

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
postcss-inline-svg	devDependencies	major	^5.0.0 -> ^6.0.0

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2021-33587	#63
High	7.5	CVE-2021-3803	#91

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Release Notes

TrySound/postcss-inline-svg (postcss-inline-svg)

### [`v6.0.0`](https://togithub.com/TrySound/postcss-inline-svg/blob/HEAD/CHANGELOG.md#600) [Compare Source](https://togithub.com/TrySound/postcss-inline-svg/compare/v5.0.0...v6.0.0) - Dropped Node.js 10 and 12 support. - Fixed security vulnerabilities in dependencies.

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