Bump flat and gulp-mocha

[dependabot[bot]]

Removes flat. It's no longer used after updating ancestor dependency gulp-mocha. These dependencies need to be updated together.

Removes flat

Updates gulp-mocha from 7.0.2 to 8.0.0

Release notes

Sourced from gulp-mocha's releases.

v8.0.0

Breaking

• Require Node.js 10
• Upgrade to Mocha 8 4fa531f

https://github.com/sindresorhus/gulp-mocha/compare/v7.0.2...v8.0.0

Commits

• 2f0b810 8.0.0
• 4fa531f Require Node.js 10 and upgrade Mocha
• 93e1cbc Move to GitHub Actions (#201)
• 94af2ed Remove message from readme (#198)
• See full diff in compare view

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[github-actions[bot]]

Stale pull request message

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

[eugef]

@dependabot rebase