Update google/apiclient for PHP 8.3 compatibility

[mikkamp]

Changes proposed in this Pull Request:

This PR upgrades the google/apiclient packages and dependencies to resolve the last PHP 8.3 deprecation notice:

[08-Jan-2024 11:50:31 UTC] PHP Deprecated:  Calling get_class() without arguments is deprecated in google-listings-and-ads/vendor/google/apiclient/src/Http/REST.php on line 58

The notice was resolved in google/apiclient version 2.15.2

Packages upgraded:

composer update google/apiclient --with-all-dependencies

- Upgrading firebase/php-jwt (v6.9.0 => v6.10.0)
- Upgrading google/apiclient (v2.15.1 => v2.15.3)
- Upgrading google/apiclient-services (v0.323.0 => v0.331.0)
- Upgrading google/auth (v1.32.1 => v1.34.0)
- Upgrading guzzlehttp/guzzle (7.8.0 => 7.8.1)
- Upgrading guzzlehttp/promises (2.0.1 => 2.0.2)
- Upgrading guzzlehttp/psr7 (2.6.1 => 2.6.2)
- Upgrading phpseclib/phpseclib (3.0.33 => 3.0.35)

Closes #2182

Detailed test instructions:

1. Install extension on a site with PHP 8.3 and WP_DEBUG logging enabled
2. View the page Marketing > Google Listings & Ads (after being onboarded)
3. Confirm we don't get any deprecation notices logged

Changelog entry

• Update - Upgrade google/apiclient for PHP 8.3 compatibility.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (acf6ae5) 59.4% compared to head (55618c5) 59.4%.

Additional details and impacted files

@@            Coverage Diff            @@
##             develop   #2194   +/-   ##
=========================================
  Coverage       59.4%   59.4%           
  Complexity      4127    4127           
=========================================
  Files            453     453           
  Lines          16478   16478           
=========================================
  Hits            9788    9788           
  Misses          6690    6690           

Flag	Coverage Δ
php-unit-tests	59.4% <ø> (ø)

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[martynmjones]

Hey @mikkamp, thanks for the update!

Tested with PHP 8.3.0 and confirmed that no deprecation notices are displayed so LGTM ✅