build: migrate to tsdown + pin dev deps

Author: danielroe

build.config.ts

@@ -8,16 +8,16 @@
   "repository": "unjs/unrouting",
   "sideEffects": false,
   "exports": {
-    ".": "./dist/index.js"
+    ".": "./dist/index.mjs"
   },
-  "main": "./dist/index.js",
-  "module": "./dist/index.js",
-  "types": "./dist/index.d.ts",
+  "main": "./dist/index.mjs",
+  "module": "./dist/index.mjs",
+  "types": "./dist/index.d.mts",
   "files": [
     "dist"
   ],
   "scripts": {
-    "build": "unbuild",
+    "build": "tsdown",
     "dev": "vitest dev",
     "lint": "eslint .",
     "prepare": "simple-git-hooks",
@@ -33,19 +33,19 @@
     "ufo": "^1.6.3"
   },
   "devDependencies": {
-    "@antfu/eslint-config": "latest",
+    "@antfu/eslint-config": "7.4.3",
     "@types/node": "22.19.11",
-    "@vitest/coverage-v8": "latest",
+    "@vitest/coverage-v8": "4.0.18",
     "bumpp": "10.4.1",
-    "eslint": "latest",
-    "lint-staged": "latest",
+    "eslint": "10.0.0",
+    "lint-staged": "16.2.7",
     "pkg-pr-new": "0.0.63",
     "rou3": "0.7.12",
-    "simple-git-hooks": "latest",
-    "typescript": "latest",
-    "unbuild": "latest",
-    "vite": "latest",
-    "vitest": "latest",
+    "simple-git-hooks": "2.13.1",
+    "tsdown": "0.20.3",
+    "typescript": "5.9.3",
+    "vite": "7.3.1",
+    "vitest": "4.0.18",
     "vue-router": "5.0.2"
   },
   "resolutions": {