The new timeout feature doesn't work correctly for serial tests (await)

[3cp]

Demo code test.js
There are 2 serial tests: both needs 3 seconds to run, both well below the default 5 seconds timeout limit.

const { test } = require('zora');

function delay(ms) {
  return new Promise(resolve => {
    setTimeout(resolve, ms);
  });
}

test('group', async t => {
  await t.test('one', async t => {
    await delay(3000);
    t.ok(1);
  });
  await t.test('two', async t => {
    await delay(3000);
    t.ok(2);
  });
});

But the test "two" failed on the 5 secs limit check.

> node test.js
TAP version 13
# group
# one
ok 1 - should be truthy
# two
ok 2 - should be truthy
not ok 3 - The test did no complete on time. refer to https://github.com/lorenzofox3/zora/tree/master/zora#test-timeout for more info
  ---
    operator: "timeout"
    actual: "test takes longer than 5000ms to complete"
    expected: "test takes less than 5000ms to complete"
  ...

1..3
# tests 3
# pass  2
# fail  1
# skip  0

The reason is the timeout check started at same time for both tests: "one" and "two", the timeout check should only start for each test at the time it really starts.

The bug only appears if users use await to force serial tests.

[3cp]

My bad, the timeout failure is not on test "two", but the parent test.

test('group', async t => {
  await t.test...
  await t.test...
}, { timeout: 10000 });

The outer test timeout is needed.