Flaky test AbstractDbCacheTest::testSetMultiple

Sometimes fails due to time lag.

..F............................................................  63 / 124 ( 50%)
.............................................................   124 / 124 (100%)

Time: 00:23.671, Memory: 22.00 MB

There was 1 failure:

1) Yiisoft\Cache\Db\Tests\Driver\Oracle\DbCacheTest::testSetMultiple with data set #1 (2)
Failed asserting that null matches expected 1.

/home/runner/work/cache-db/cache-db/tests/Common/AbstractDbCacheTest.php:553
/home/runner/work/cache-db/cache-db/tests/Common/AbstractDbCacheTest.php:177

Test code:
https://github.com/yiisoft/cache-db/blob/aa6a67f4d8b712e8251e5451e18cf7631d5748f6/tests/Common/AbstractDbCacheTest.php#L170-L179

Cache expire precision is 1 second, so

• 1.99: execute setMultiple with ttl = 2 -> expire is set to 3 (time() = 1 + 2 seconds)
• 2.00: execute get -> ok,
• 2.09: execute get -> ok
• …
• 3.00: execute get -> fail

Start in tests/Common/AbstractDbCacheTest.php around lines 170-179 and 553, then run the focused Oracle DbCacheTest::testSetMultiple test. Review how the test handles the one-second cache-expiration precision and verify that the timing-boundary failure is eliminated without weakening the expiration behavior.