Bump mdast-util-toc from 6.1.1 to 7.0.0

Bumps mdast-util-toc from 6.1.1 to 7.0.0.

Release notes

Sourced from mdast-util-toc's releases.

7.0.0

Change

• a541a47 Update @types/mdast migrate: update too
• b024d88 Change to require Node.js 16 migrate: update too
• 09b1c2e Change to use export map migrate: don’t use private APIs
• 2e3ff5b Change to return undefined, not null migrate: expect undefined

Full Changelog: https://github.com/syntax-tree/mdast-util-toc/compare/6.1.1...7.0.0

Commits

• 3488516 7.0.0
• b024d88 Change to require Node.js 16
• 09b1c2e Change to use export map
• 801ecd3 Refactor example
• ca99c66 Refactor docs
• 2311ec3 Replace dependency
• 2e3ff5b Change to return undefined, not null
• c96a9eb Refactor code-style
• f82228d Refactor .npmrc
• 7547092 Refactor package.json, tsconfig.json
• Additional commits viewable in compare view