[Snyk] Security upgrade gatsby-plugin-purgecss from 5.0.0 to 6.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • packages/gatsby-theme-kb/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1090595	Yes	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1255640	Yes	Proof of Concept

Commit messages

Package name: gatsby-plugin-purgecss

The new version differs by 250 commits.

• cf8f26d Release 6.0.0
• fbedfdf docs: add gatsby v3 info
• 9e76865 build: using webpack 4 types
• be1f095 build: move tests to gatsby v3
• 1a5050e Merge pull request #950 from anantoghosh/v6
• 5661856 docs: add tailwind note
• d14a717 ci: list correct sass package
• 75cbe97 ci: try again
• ec64e48 ci: return 1 on error
• f2596da ci: solve peer dep install issue
• 1354846 ci: throw on error
• e3d9c53 tests: add tailwind ci tests
• 92fc852 chore: add editor config
• be9793e test: add initial tailwind test folder
• 4f38c6a build: update release-it config
• 07efd88 ci: update test script
• 98ec9c5 build: update renovate config
• 6a4a4bc docs: update options
• 0ec8735 build: remove unused scripts
• 732e825 feat: remove reject option, add printSummary
• f7602e3 fix: update tailwind regex
• 5476e59 build: remove unneeded packages
• b7443ed feat: update test build and scripts
• 5651c2b fix: set default content path

See the full diff

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