Fix PHPUnit 12 data provider syntax

Replace @dataProvider annotation with #[DataProvider] attribute
as required by PHPUnit 12.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mpyw

tests/BasicVariableAssignmentTest.php

@@ -8,16 +8,16 @@
 use Mpyw\LaravelMySqlSystemVariableManager\MySqlConnection;
 use Mpyw\LaravelMySqlSystemVariableManager\Replacer;
 use Mpyw\LaravelMySqlSystemVariableManager\Value;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class BasicVariableAssignmentTest extends TestCase
 {
     /**
-     * @test
      * @param mixed $expectedOriginal
      * @param mixed $newValue
      * @param mixed $expectedChanged
-     * @dataProvider provideBasicVariables
      */
+    #[DataProvider('provideBasicVariables')]
     public function testAssignments(string $variableName, bool $emulated, $expectedOriginal, $newValue, $expectedChanged): void
     {
         $this->{$emulated ? 'onEmulatedConnection' : 'onNativeConnection'}(function (MySqlConnection $db) use ($variableName, $expectedOriginal, $newValue, $expectedChanged): void {
@@ -28,12 +28,11 @@ public function testAssignments(string $variableName, bool $emulated, $expectedO
     }
 
     /**
-     * @test
      * @param mixed $expectedOriginal
      * @param mixed $newValue
      * @param mixed $expectedChanged
-     * @dataProvider provideBasicVariables
      */
+    #[DataProvider('provideBasicVariables')]
     public function testTemporaryAssignments(string $variableName, bool $emulated, $expectedOriginal, $newValue, $expectedChanged): void
     {
         $this->{$emulated ? 'onEmulatedConnection' : 'onNativeConnection'}(function (MySqlConnection $db) use ($variableName, $expectedOriginal, $newValue, $expectedChanged): void {