test(GroupsTest): convert @dataProvider docblock to PHPUnit attribute

PHPUnit 13 dropped support for the legacy `@dataProvider` docblock
metadata in favour of PHP attributes. The `testEditRoundTripsHighBitFlagsAsPositiveIntegers`
test was the only remaining survivor across the suite; converting to
`#[DataProvider('highBitFlagProvider')]` keeps the round-trip coverage
green under PHPUnit 13.x without changing test semantics.

Pin for #1340 (Composer dependabot bump from 11.5.55 to 13.1.8).

Author: rumblefrog

web/tests/api/GroupsTest.php

@@ -2,6 +2,7 @@
 
 namespace Sbpp\Tests\Api;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use Sbpp\Tests\ApiTestCase;
 use Sbpp\Tests\Fixture;
 
@@ -203,9 +204,7 @@ public static function highBitFlagProvider(): iterable
         yield 'high+low mix (bit 31 + bit 0)' => [2147483648 + 1];
     }
 
-    /**
-     * @dataProvider highBitFlagProvider
-     */
+    #[DataProvider('highBitFlagProvider')]
     public function testEditRoundTripsHighBitFlagsAsPositiveIntegers(int $flags): void
     {
         $this->loginAsAdmin();