chore(main): release 21.0.0

[astronvimbot]

🤖 I have created a release beep boop

21.0.0 (2026-04-30)

⚠ BREAKING CHANGES

• typst: remove the outdated .vim plugin; configure treesitter (#1761)
• astronvim v6 compatible (#1730)

Features

• astronvim v6 compatible (#1730) (39edda0)
• rust: bump rustaceanvim to v8+ (#1755) (c55e6c1)

Bug Fixes

• inc-rename-nvim: lazy load on cmd instead of lsp setup (#1750) (85c0339)
• refactoring-nvim: fix dependencies and API usage for latest version (#1756) (7c1a46d)
• rust: drop incompatible root_dir under native_lsp_config (#1754) (0f87ef8)
• rust: rename files.excludeDirs to files.exclude (#1753) (36463ca)
• trouble-nvim: fix error when lspkind is unaccessible by explicitly passing nil (#1751) (6129af8)
• typescript-all-in-one: update lsp configuration and APIs (4521b6c)
• typst: remove the outdated .vim plugin; configure treesitter (3bcb278)
• typst: remove the outdated .vim plugin; configure treesitter (#1761) (3bcb278)

---

This PR was generated with Release Please. See documentation.