chore(deps): update devdependency @types/bun to ^1.1.18

Author: renovate[bot]

package.json

@@ -43,7 +43,7 @@
   "devDependencies": {
     "@hono/node-server": "^1.13.7",
     "@mjackson/node-fetch-server": "^0.5.0",
-    "@types/bun": "^1.1.17",
+    "@types/bun": "^1.1.18",
     "@types/deno": "^2.0.0",
     "@types/node": "^22.10.7",
     "@vitest/coverage-v8": "^2.1.8",