DEV: Bump vitest and vite (#40450)

Bumps `vitest` to `4.1.8`, and bumps the `vite` subdependency to `8.x`.
Vite 8 dropped its dependency on `esbuild`, so this means `esbuild` is
no longer in our node_modules

.licensee.json

@@ -4,7 +4,8 @@
     "spdx": [
       "CC-BY-3.0",
       "CC-BY-4.0",
-      "Apache-2.0 WITH LLVM-exception"
+      "Apache-2.0 WITH LLVM-exception",
+      "MPL-2.0"
     ]
   },
   "packages": {

frontend/asset-processor/package.json

@@ -42,6 +42,6 @@
     "pnpm": "^10"
   },
   "devDependencies": {
-    "vitest": "^4.0.18"
+    "vitest": "^4.1.8"
   }
 }