Bump svelte2tsx from 0.7.13 to 0.7.21

Bumps [svelte2tsx](https://github.com/sveltejs/language-tools) from 0.7.13 to 0.7.21.
- [Release notes](https://github.com/sveltejs/language-tools/releases)
- [Commits](sveltejs/language-tools@svelte2tsx-0.7.13...svelte2tsx-0.7.21)

---
updated-dependencies:
- dependency-name: svelte2tsx
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

shepherd.js/package.json

@@ -87,7 +87,7 @@
     "rollup-plugin-visualizer": "^5.11.0",
     "svelte": "^4.2.12",
     "svelte-preprocess": "^6.0.3",
-    "svelte2tsx": "^0.7.8",
+    "svelte2tsx": "^0.7.21",
     "typescript": "^5.4.5"
   },
   "packageManager": "pnpm@9.2.0",