Fix flaky unit tests

Author: wojtekmaj

packages/react-date-picker/src/DateInput.spec.tsx

@@ -149,7 +149,7 @@ describe('DateInput', () => {
 
     const { container, rerender } = await render(<DateInput {...defaultProps} value={date} />);
 
-    rerender(<DateInput {...defaultProps} value={null} />);
+    await rerender(<DateInput {...defaultProps} value={null} />);
 
     const nativeInput = container.querySelector('input[type="date"]');
     const customInputs = page.getByRole('spinbutton');

packages/react-date-picker/src/DatePicker.spec.tsx

@@ -304,7 +304,7 @@ describe('DatePicker', () => {
 
     expect(calendar).not.toBeInTheDocument();
 
-    rerender(<DatePicker {...defaultProps} isOpen />);
+    await rerender(<DatePicker {...defaultProps} isOpen />);
 
     const calendar2 = container.querySelector('.react-calendar');