MNT Fix unit test providers

[GuySartorelli]

Fixes https://github.com/silverstripe/silverstripe-framework/actions/runs/13299837085/job/37139181714?pr=11602

1) SilverStripe\Forms\Tests\GridField\GridFieldPrintButtonTest::testHandlePrintEscaping
The data provider specified for SilverStripe\Forms\Tests\GridField\GridFieldPrintButtonTest::testHandlePrintEscaping is invalid
Data Provider method SilverStripe\Forms\Tests\GridField\GridFieldPrintButtonTest::provideHandlePrintEscaping() is not static

/home/runner/work/silverstripe-framework/silverstripe-framework/tests/php/Forms/GridField/GridFieldPrintButtonTest.php:199

 There were 2 PHPUnit test runner deprecations:

1) Metadata found in doc-comment for method SilverStripe\Forms\Tests\GridField\GridFieldPrintButtonTest::testHandlePrintEscaping(). Metadata in doc-comments is deprecated and will no longer be supported in PHPUnit 12. Update your test code to use attributes instead.

2) Metadata found in doc-comment for method SilverStripe\ORM\Tests\DataObjectTest::testProvideI18nEntities(). Metadata in doc-comments is deprecated and will no longer be supported in PHPUnit 12. Update your test code to use attributes instead.

And https://github.com/silverstripe/silverstripe-framework/actions/runs/13316490516/job/37191706970

 PHP Fatal error:  Declaration of SilverStripe\ORM\DataObject@anonymous::classDescription() must be compatible with SilverStripe\ORM\DataObject::classDescription(): ?string in /home/runner/work/silverstripe-framework/silverstripe-framework/tests/php/ORM/DataObjectTest.php on line 2871

Issue

• Broken builds, merge-ups, and licenses .github#366