[BCB] Remove unused PHPStanTestCase::$useStaticReflectionProvider

Author: ondrejmirtes

UPGRADING.md

@@ -237,3 +237,4 @@ Instead of `PHPStanTestCase::createBroker()`, call `PHPStanTestCase::createRefle
 * Remove `ArrayType::castToArrayKeyType()`, `Type::toArrayKey()` instead
 * Remove `UnionType::pickTypes()`, use `pickFromTypes()` instead
 * Remove `RegexArrayShapeMatcher::matchType()`, use `matchExpr()` instead
+* Remove unused `PHPStanTestCase::$useStaticReflectionProvider`

src/Testing/PHPStanTestCase.php

@@ -49,9 +49,6 @@
 abstract class PHPStanTestCase extends TestCase
 {
 
-	/** @deprecated */
-	public static bool $useStaticReflectionProvider = true;
-
 	/** @var array<string, Container> */
 	private static array $containers = [];