test: use assertEqualsWithDelta for timer start value in TimerTest

Author: gr8man

tests/system/Debug/TimerTest.php

@@ -93,7 +93,7 @@ public function testStartWithZeroTime(): void
 
         $timers = $timer->getTimers();
 
-        $this->assertSame(0.0, $timers['test1']['start']);
+        $this->assertEqualsWithDelta(0.0, $timers['test1']['start'], PHP_FLOAT_EPSILON);
     }
 
     public function testThrowsExceptionStoppingNonTimer(): void