[1.x] Fix PHP 8.2 compat issue in uses of DateTime::modify()
#349
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As noted in php/php-src#9950 there is a behavioral change in PHP 8.2 if you make a call like
$dateTime->modify('+-300 seconds')
as a result of another bug fix in the date/time handling libraries. As the bundle does not enforce TTLs to be a positive number (and the functional tests abuse this a bit), this is a practical fix to ensure anything passing a negative TTL value doesn't catastrophically break.