Upgrade opis/closure:v4 for google/cloud-core

[SerheyDolgushev]

Is your feature request related to a problem? Please describe.
The latest version of google/cloud-core requires v3 of opis/closure, which is not very PHP 8.4 friendly. Because of that, google/cloud-core leads to some deprecations when used on PHP 8.4.

Describe the solution you'd like
Upgrade opis/closure to v4 for google/cloud-core .

Describe alternatives you've considered
Make opis/closure:v3 PHP 8.4 friendly:

• Fix PHP 8.4 deprecation opis/closure#157
• @sorinsarca is working on the new opis/closure:3.7.0 release.

[sorinsarca]

v3.7.0 was released

[bshaffer]

added support for v4 in #8559

[bshaffer]

There doesn't appear to be an obvious way to move from v3 to v4 without breaking backwards compatibility. It may make more sense to create a new class such as OpisClosureSerializerV4 and default to using that instead.

[SerheyDolgushev]

@bshaffer thank you very much for fixing it!