Python 3.12 support

[yakimka]

Hello, I'm encountering E902 errors with flake8 after installing the flake8-mock plugin.

Steps to Reproduce:

1. Create a file named test_foo.py.
2. Execute the command:

   docker run --rm -it -v $(pwd)/test_foo.py:/code/test_foo.py -w /code python:3.12-slim-bullseye bash

3. Install flake8:

   pip install flake8

4. Run flake8 and observe that there are no errors:

   flake8

5. Install flake8-mock:

   pip install flake8-mock==0.4

6. Run flake8 again:

   flake8

7. Now, observe the error:

   ./test_foo.py:28:2: E902 TokenError: unterminated string literal (detected at line 28)

Content of test_foo.py:

def test_foo():
    assert ""