@std/cli/unstable_spinner.ts has flaky test

[BlackAsLight]

https://github.com/denoland/std/actions/runs/13148545139/job/36691645547

ERRORS 

Spinner constructor accepts interval => ./cli/unstable_spinner_test.ts:136:6
error: AssertionError: Values are not equal.


    [Diff] Actual / Expected


    [
      "\r\x1b[K⠋\x1b[0m ",
      "\r\x1b[K⠙\x1b[0m ",
      "\r\x1b[K⠹\x1b[0m ",
-     "\r\x1b[K⠸\x1b[0m ",
      "\r\x1b[K",
    ]

  throw new AssertionError(message);
        ^
    at assertEquals (file:///D:/a/std/std/assert/equals.ts:64:9)
    at file:///D:/a/std/std/cli/unstable_spinner_test.ts:163:5

 FAILURES 

Spinner constructor accepts interval => ./cli/unstable_spinner_test.ts:136:6

FAILED | 3088 passed (2720 steps) | 1 failed | 22 ignored (1m31s)

error: Test failed
Error: Process completed with exit code 1.

std/cli/unstable_spinner_test.ts

Lines 136 to 167 in 3b75ee7

	Deno.test("Spinner constructor accepts interval", async () => {
	try {
	stub(Deno.stdin, "setRaw");
	const expectedOutput = [
	"\r\x1b[K⠋\x1b[0m ",
	"\r\x1b[K⠙\x1b[0m ",
	"\r\x1b[K⠹\x1b[0m ",
	"\r\x1b[K",
	];
	const actualOutput: string[] = [];
	stub(
	Deno.stdout,
	"writeSync",
	(data: Uint8Array) => {
	const output = decoder.decode(data);
	actualOutput.push(output);
	return data.length;
	},
	);
	const spinner = new Spinner({ interval: 300 });
	spinner.start();
	await delay(1000); // 100ms buffer
	spinner.stop();
	assertEquals(actualOutput, expectedOutput);
	} finally {
	restore();
	}
	});

[timreichen]

This might be due to timing inconsistencies.

#6404

This PR adds more leeway. Hopefully this solves the issue.

[kt3k]

Fixed by #6404