Fix make of_format fail in ubuntu

ci/check/run_license_format.py

@@ -32,7 +32,7 @@ def get_txt(path: str):
 
 
 def check_file(path):
-    with open(path) as f:
+    with open(path, "r", encoding="utf-8") as f:
         content = f.read()
         txt = get_txt(path)
         if "import doctest" in content and "raise_on_error=True" not in content: