[test] Unflake `deterministic build - changing deployment id` test (#91646)
[Test duration
metric](https://app.datadoghq.com/ci/test/runs?query=test_level%3Atest%20%40git.repository.id%3A%22github.com%2Fvercel%2Fnext.js%22%20%40test.name%3A%22deterministic%20build%20-%20changing%20deployment%20id%20build%20output%20API%20-%20standard%20builder%20should%20produce%20identical%20build%20outputs%20even%20when%20changing%20deployment%20id%22%20%40test.type%3A%22turbopack%22%20%40test.status%3Apass&agg_m=count&agg_m_source=base&agg_t=count&fromUser=false&index=citest&start=1773311049123&end=1773915849123&paused=false)
The test frequently times out in CI. When it succeeds, it runs close to
the 60 second timeout limit, so we increase it to 120 seconds to reduce
flakiness.