test: fix webcrypto on node 18 (#6892)

Author: hi-ogawa

test/test-utils/index.ts

@@ -2,6 +2,7 @@ import type { Options } from 'tinyexec'
 import type { UserConfig as ViteUserConfig } from 'vite'
 import type { WorkspaceProjectConfiguration } from 'vitest/config'
 import type { UserConfig, Vitest, VitestRunMode } from 'vitest/node'
+import { webcrypto as crypto } from 'node:crypto'
 import fs from 'node:fs'
 import { Readable, Writable } from 'node:stream'
 import { fileURLToPath } from 'node:url'