deps: bump mdast-util-to-string from 2.0.0 to 3.1.1

[dependabot[bot]]

Bumps mdast-util-to-string from 2.0.0 to 3.1.1.

Release notes

Sourced from mdast-util-to-string's releases.

3.1.1

Misc

• 7380cd7 353622c Add improved docs
• eede172 537d210 b03ce26 e02b8b7 Refactor code-style
• ae5234c 1232790 Update tsconfig.json

Full Changelog: https://github.com/syntax-tree/mdast-util-to-string/compare/3.1.0...3.1.1

3.1.0

• bc43530 Add includeImageAlt option

3.0.0

• 7199f30 Remove node.title support
• e101488 Add JSDoc based types
• 08f972e Use ESM

Commits

• b13a458 3.1.1
• 7380cd7 Add improved docs
• 748289f Add tests for exposed identifiers
• ab7eb0b Use Node test runner
• eede172 Refactor code-style
• 537d210 Refactor to move implementation to lib/
• ae5234c Update tsconfig.json
• 08ee7ae Update Actions
• 8065eaf Update dev-dependencies
• 353622c Add improved docs
• Additional commits viewable in compare view

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