Fix some lint errors in pylint 2.10.2 (#2226)

esphome/writer.py

@@ -481,5 +481,5 @@ GITIGNORE_CONTENT = """# Gitignore settings for ESPHome
 def write_gitignore():
     path = CORE.relative_config_path(".gitignore")
     if not os.path.isfile(path):
-        with open(path, "w") as f:
+        with open(file=path, mode="w", encoding="utf-8") as f:
             f.write(GITIGNORE_CONTENT)