test: fix flaky test

Author: antongolub

test/core.test.js

@@ -681,7 +681,7 @@ describe('core', () => {
       test('abort signal is transmittable through pipe', async () => {
         const ac = new AbortController()
         const { signal } = ac
-        const p1 = $({ signal })`echo test`
+        const p1 = $({ signal, nothrow: true })`echo test`
         const p2 = p1.pipe`sleep 999`
 
         try {