Remove implicit casts in FileLock.php

[greg0ire]

Commit messages hold justifications.

This is the Lock class.

orm/src/Cache/Lock.php

Lines 10 to 25 in d5ba106

	class Lock
	{
	public int $time;
	public function __construct(
	public string $value,
	int|null $time = null,
	) {
	$this->time = $time ?? time();
	}
	public static function createLockRead(): Lock
	{
	return new self(uniqid((string) time(), true));
	}
	}

Although its constructor is public, it is called exactly once inside src, inside Lock::createLockRead(). This means Lock::$value always contains a non-falsy-string.