Flaky spinner test "Spinner constructor accepts interval"

[lionel-rowe]

Describe the bug

Test "Spinner constructor accepts interval" in cli/unstable_spinner_test.ts sometimes fails in CI due to interval running slower than expected.

https://github.com/denoland/std/actions/runs/11567686029/job/32198412079?pr=6153

Spinner constructor accepts interval => ./cli/unstable_spinner_test.ts:58:6
error: AssertionError: Expect 25 > 50
  throw new AssertionError(msg ?? `Expect ${actualString} > ${expectedString}`);
        ^
    at assertGreater (file:///D:/a/std/std/assert/greater.ts:29:9)
    at file:///D:/a/std/std/cli/unstable_spinner_test.ts:73:3

Steps to Reproduce

See above test run output

Expected behavior

No test failures

Environment

OS: Ubuntu 20.04, WSL on Windows 11
deno version: 2.0.3
std version: [email protected]