v2.1.11

Consider this version is for react19 users

The changes made by @talatkuyuk:

• Update unist utils and unified plugins section in README
• Update sponsorship announcement in README
• Remove unnecessary tsconfig options
• Use just "src" directory instead of relative path in include of tsconfig
• Add type checking for test files
• Add type checking for eslint config
• Fix type-coverage ignoring "tests" directory
• Fix an issue about tsconfig for build
• Move @types/mdx into dependencies because of exporting some types from it
• Update devDependencies
• Reproduce package-lock.json
• Fix an CI/CD issue about npm ci regarding with lightningcss which vitest uses