Add TestCase::createConfigured/PartialMock() to stub

Previously the create-configured and create-partial mock-methods were not
part of the stub.

Add them.

stubs/TestCase.phpstub

@@ -14,6 +14,24 @@ abstract class TestCase extends Assert implements Test, SelfDescribing
      */
     protected function createMock($class) {}
 
+    /**
+     * @template T
+     * @param class-string<T> $class
+     * @param array<string, mixed> $config
+     * @return MockObject&T
+     */
+    protected function createConfiguredMock($class, array $config) {}
+
+    /**
+     * Returns a partial test double for the specified class.
+     *
+     * @template T
+     * @param class-string<T> $class
+     * @param array<array-key, string> $methods
+     * @return MockObject&T
+     */
+    protected function createPartialMock($class, array $methods) {}
+
     /**
      * Returns a builder object to create mock objects using a fluent interface.
      *