chore(deps-dev): update flake8 requirement

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@6.0.0...7.0.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -55,7 +55,7 @@ test = [
     "black ==23.12.0",
     "mypy >=1.0.0,<2.0.0",
     "types-tree-sitter",
-    "flake8 >=6.0.0,<7.0.0",
+    "flake8 >=6.0.0,<8.0.0",
     "ruff >=0.0.275,<0.2.0",
     "isort >=5.0.0,<6.0.0",
     "nltk >=3.0.0,<4.0.0",