Remove unused import

Author: kriszyp

integrationTests/utils/harperLifecycle.ts

@@ -1,5 +1,5 @@
 import assert from 'node:assert/strict';
-import { spawn, ChildProcess, exec } from 'node:child_process';
+import { spawn, ChildProcess } from 'node:child_process';
 import { createWriteStream, existsSync, rmSync, type WriteStream } from 'node:fs';
 import { join } from 'node:path';
 import { tmpdir } from 'node:os';