[Fix] Carbon v3 new method default parameter compatibility

[daika7ana]

Takes into account Carbon v3 new default parameter value on the diffInSeconds method.

Carbon v2 method blueprint:

public function diffInSeconds($date = null, $absolute = true)

Carbon v3 method blueprint:

public function diffInSeconds($date = null, bool $absolute = false): float

Fixes failing tests:

laravel-model-caching/tests/Integration/CachedModelTest.php

Line 180 in a38c905

public function testModelCacheDoesntInvalidateDuringCooldownPeriod()

[mikebronner]

Needs to run and pass all tests, for some reason they weren't triggered.