v2.1.0

What's Changed

• Replaced typed-rest-client with @actions/http-client for GitHub API calls
  to eliminate the Node 24 DEP0169 deprecation warning about url.parse() (#5 by @vmaerten).
• Modernized the TypeScript tooling stack (vitest, oxlint, @actions/core@2,
  @actions/io@2, updated @types/node, @vercel/ncc, prettier, etc.) (#5 by @vmaerten).
• Migrated the project to ESM (sources + bundle). Aligns with the new
  @actions/* ESM-only majors and produces a ~47% smaller dist/index.js (#5 by @vmaerten).
• Upgraded @actions/core 2 → 3, @actions/http-client 2 → 4,
  @actions/io 2 → 3, @actions/tool-cache 2 → 4, typescript 5 → 6, and
  markdownlint-cli 0.47 → 0.48 (#5 by @vmaerten).