style: apply linter fixes

aider/args.py

@@ -822,7 +822,6 @@ def get_parser(default_config_files, git_root):
         ),
     )
 
-
     ##########
     group = parser.add_argument_group("Deprecated model settings")
     # Add deprecated model shortcut arguments

aider/main.py

@@ -14,8 +14,8 @@ except ImportError:
     git = None
 
 import importlib_resources
-from dotenv import load_dotenv
 import shtab
+from dotenv import load_dotenv
 from prompt_toolkit.enums import EditingMode
 
 from aider import __version__, models, urls, utils
@@ -509,7 +509,6 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
         print(shtab.complete(parser, shell=args.shell_completions))
         sys.exit(0)
 
-
     if git is None:
         args.git = False