aider: Shortened the docstring in aider/repo.py to comply with the 100 characters line length limit.

# Aider chat conversation:

USER: I ran this command:

 pre-commit run --files aider/repo.py

And got this output:

isort....................................................................Passed
black....................................................................Passed
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

aider/repo.py:247:101: E501 line too long (111 > 100 characters)
        """
        Returns a list of all files which are dirty (not committed), either staged or in the working directory.
        """

                                                                                        ^

ASSISTANT: Please add the file `aider/repo.py` to the chat so I can make the necessary changes.

USER: I added these files to the chat: aider/repo.py

ASSISTANT: To fix the flake8 error, we need to shorten the docstring to comply with the line length limit of 100 characters.

Here is the *SEARCH/REPLACE* block:

aider/repo.py
```python
<<<<<<< SEARCH
        """
        Returns a list of all files which are dirty (not committed), either staged or in the working directory.
        """
=======
        """
        Returns a list of all files which are dirty (not committed), either staged or in the working
        directory.
        """
>>>>>>> REPLACE
```

aider/repo.py

@@ -244,7 +244,8 @@ class GitRepo:
 
     def get_dirty_files(self):
         """
-        Returns a list of all files which are dirty (not committed), either staged or in the working directory.
+        Returns a list of all files which are dirty (not committed), either staged or in the working
+        directory.
         """
         dirty_files = set()