chore: fix passing filename to spawn read

test/many.ts

@@ -1,10 +1,7 @@
 import t from 'tap'
-import { fileURLToPath } from 'url'
 import spawnRead from './fixtures/setup.ts'
 import { read } from '../src/read.ts'
 
-const __filename = fileURLToPath(import.meta.url)
-
 const times = new Array(18).fill(null).map((_, i) => (i + 1).toString())
 
 async function child () {
@@ -27,7 +24,7 @@ const main = () => {
       acc[`num ${k}`] = k
       return acc
     }, {})
-    const { stdout, stderr } = await spawnRead(__filename, writes)
+    const { stdout, stderr } = await spawnRead(import.meta.url, writes)
 
     t.equal(stdout, Object.keys(writes).join(' ') + ' ')
     t.equal(stderr, times.join(' ') + '\n')