deps-dev(deps-dev): update phpunit/phpunit requirement from ^11.5 to ^11.5 || ^12.0 in the testing group

[dependabot]

Updates the requirements on phpunit/phpunit to permit the latest version.
Updates phpunit/phpunit to 12.3.12

Release notes

Sourced from phpunit/phpunit's releases.

PHPUnit 12.3.12

• No changes; phpunit.phar rebuilt with updated dependencies

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Changelog

Sourced from phpunit/phpunit's changelog.

[12.3.12] - 2025-09-21

• No changes; phpunit.phar rebuilt with updated dependencies

[12.3.11] - 2025-09-14

Changed

• #6366: Exclude __sleep() and __wakeup() from test double code generation on PHP >= 8.5

[12.3.10] - 2025-09-11

Changed

• #6353: Disable performance optimization for tests requiring Xdebug
• #6357: Also collect E_DEPRECATED issues when building the test suite

[12.3.9] - 2025-09-11

Changed

• Do not use __sleep() method (which will be deprecated in PHP 8.5)

[12.3.8] - 2025-09-03

Fixed

• #6340: Implicitly enabled display of deprecation details is not disabled when it should be

[12.3.7] - 2025-08-28

Changed

• #[IgnorePhpunitDeprecations] is now considered for test runner deprecations (where applicable)

[12.3.6] - 2025-08-20

Changed

• Do not configure report_memleaks setting (which will be deprecated in PHP 8.5) for PHPT processes

[12.3.5] - 2025-08-16

Changed

• #6319: Detect premature end of PHPUnit's main PHP process
• #6321: Allow error_reporting=E_ALL for --check-php-configuration

Fixed

... (truncated)

Commits

• 729861f Prepare release
• ab8cb04 Merge branch '11.5' into 12.3
• 0e997e5 Fix
• 0a36141 Merge branch '10.5' into 11.5
• b4a904e Merge branch '9.6' into 10.5
• 8959a05 Merge branch '8.5' into 9.6
• 3f5745c Update tools
• 88b4856 Update dependencies
• 0599c0f Update dependencies
• 6a62f2b Prepare release
• Additional commits viewable in compare view

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