Fix notice "Object of class DateTimeImmutable could not be converted to int" in CookieCollection::has

[mspirkov]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues

Found this bug using PHPStan.

Then I wrote tests, and they confirmed the error.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.49%. Comparing base (53bdfc3) to head (d10cecf).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #20530      +/-   ##
============================================
- Coverage     64.49%   64.49%   -0.01%     
+ Complexity    11574    11571       -3     
============================================
  Files           433      433              
  Lines         37606    37604       -2     
============================================
- Hits          24253    24251       -2     
  Misses        13353    13353              

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[samdark]

Good catch and I like the early returns. Thanks!