Add phpstan until level 7

tests/Spout/Common/Entity/Style/BorderTest.php

@@ -113,7 +113,7 @@ class BorderTest extends TestCase
                     $border->addPart($borderPart);
                     $this->assertCount(1, $border->getParts());
 
-                    /** @var $part BorderPart */
+                    /** @var BorderPart $part */
                     $part = $border->getParts()[$allowedName];
 
                     $this->assertEquals($allowedStyle, $part->getStyle());

tests/Spout/Common/Entity/Style/ColorTest.php

@@ -11,7 +11,7 @@ use PHPUnit\Framework\TestCase;
 class ColorTest extends TestCase
 {
     /**
-     * @return array
+     * @return array<array>
      */
     public function dataProviderForTestRGB()
     {
@@ -54,7 +54,7 @@ class ColorTest extends TestCase
     }
 
     /**
-     * @return array
+     * @return array<array>
      */
     public function dataProviderForTestRGBAInvalidColorComponents()
     {