chore: bump bun-types from 1.1.15 to 1.1.21

Bumps [bun-types](https://github.com/oven-sh/bun/tree/HEAD/packages/bun-types) from 1.1.15 to 1.1.21.
- [Release notes](https://github.com/oven-sh/bun/releases)
- [Commits](https://github.com/oven-sh/bun/commits/bun-v1.1.21/packages/bun-types)

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

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

package.json

@@ -45,7 +45,7 @@
   "homepage": "https://github.com/opendevtools/telefonnummer#readme",
   "devDependencies": {
     "@biomejs/biome": "1.8.1",
-    "bun-types": "1.1.15",
+    "bun-types": "1.1.21",
     "rimraf": "5.0.7",
     "typescript": "5.4.5"
   },