Upgrade cache dependency for reconnection support

[premtsd-code]

Summary

• Upgrade utopia-php/cache to 1.0.* for reconnection support
• Upgrade phpunit to 9.6.*
• Pin doctrine/instantiator to 2.0.0 for PHP 8.2/8.3 compatibility

Test plan

• Run composer install to verify dependencies resolve
• Run composer test to verify tests pass

Summary by CodeRabbit

• Chores
  • Updated PHP package dependencies to enhance system stability and testing capabilities.

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Walkthrough

This pull request updates dependencies in composer.json. The utopia-php/cache package is upgraded from version 0.13.* to 1.0., phpunit/phpunit is updated from ^9.3 to 9.6., and doctrine/instantiator version 2.0.0 is added as a new development dependency. The changes affect four lines added and three lines removed, with all modifications confined to the composer.json file.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: upgrading the utopia-php/cache dependency from 0.13.* to 1.0.* for reconnection support, which is the primary objective of the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@composer.json`:
- Around line 35-38: phpunit.xml is using deprecated attributes and lacks the
current PHPUnit 9.6 XML schema; run ./vendor/bin/phpunit --migrate-configuration
to update the file to the PHPUnit 9.6 schema, then review and commit the changes
to phpunit.xml ensuring the namespace/schemaLocation are present and deprecated
attributes (e.g., backupGlobals) are replaced with the modern structures such as
the <coverage> configuration; confirm tests still run with phpunit/phpunit 9.6.*
and doctrine/instantiator 2.0.0.