[Snyk] Security upgrade @storybook/preact from 5.3.18 to 6.0.0

[rv-securitytools]

This PR was automatically created by Snyk using the credentials of a real user.

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:
  • build-system/tasks/storybook/package.json
  • build-system/tasks/storybook/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	798/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 8.1	Remote Code Execution (RCE) SNYK-JS-EJS-2803307	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: @storybook/preact

The new version differs by 250 commits.

• b97e2ee v6.0.0
• de37d6f Update root, peer deps to 6.0.0
• ba55375 6.0.0 changelog
• 30d685c Merge pull request ISSUE : Amp validator shows input type="file" as invalid. any alternate method to use type="file" ? ampproject/amphtml#11877 from storybookjs/chore_add_api_section_snippets
• e9ec609 Merge pull request amp-bind does not support splice with objects ampproject/amphtml#11882 from storybookjs/add_faq_to_docs
• 7096da8 Merge pull request Design Review 2017-11-01 (AMP extension experience, style restriction removal update) ampproject/amphtml#11872 from storybookjs/chore_add_workflow_snippets
• c55b61d Merge pull request Intent to implement: partially drop restriction on style attributes ampproject/amphtml#11881 from storybookjs/add-readmes-for-deprecated-content
• f899683 adds faq to the documentation
• ab88075 Add deprecated docs to monorepo
• fe3b3e0 Merge branch 'next' into chore_add_api_section_snippets
• 6eee72c Merge branch 'next' into chore_add_workflow_snippets
• d8180f0 component-story-with-query was adjusted.
• 7a34522 Merge pull request Add getSelectedText to amp-bind ampproject/amphtml#11867 from storybookjs/add-install-snippet
• 1a8351e Merge pull request Defer building system layer until pages have been initialized ampproject/amphtml#11878 from storybookjs/documentation_snippets_updates
• e680f98 Merge pull request Weekly Status 2017-10-30 ampproject/amphtml#11876 from storybookjs/docs/preview-entries
• 313a8b7 TS => js
• d063351 Merge pull request Lock screen orientation to portrait in supported browsers ampproject/amphtml#11880 from storybookjs/6.0-docs-tweaks
• fbdf836 fix broken markdown
• 5bddd6f updates per feedback
• 2581f63 api section feedback changes
• 9daa2b7 Merge pull request can we customize datepicker calendar design in amp (Google AMP) ?  ampproject/amphtml#11879 from storybookjs/remove-angular-dummy-snippet
• 483a8cf Remove angular dummy snippet
• 714076b removes the shell and json file references.
• 99aa694 initial snippets for api section

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