scripts: twister: add type hint to twister_main.py

Twister main expects an instance of TwisterEnv. Let's the linter know
about this.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>

scripts/pylib/twister/twisterlib/twister_main.py

@@ -3,6 +3,7 @@
 # Copyright (c) 2022 Google
 # SPDX-License-Identifier: Apache-2.0
 
+import argparse
 import colorama
 import logging
 import os
@@ -63,7 +64,7 @@ def init_color(colorama_strip):
     colorama.init(strip=colorama_strip)
 
 
-def main(options, default_options):
+def main(options: argparse.Namespace, default_options: argparse.Namespace):
     start_time = time.time()
 
     # Configure color output