Update flake8 requirement from ~=6.0 to ~=7.0

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] <support@github.com>

pyproject.toml

@@ -31,7 +31,7 @@ dependencies = [
     "diskcache~=5.4",
     "fasttext-langdetect~=1.0",
     "fastwarc~=0.14.0",
-    "flake8~=6.0",
+    "flake8~=7.0",
     "fasttext @ git+https://github.com/cfculhane/fastText.git@4a44513",
     "joblib~=1.2",
     "jupyter~=1.0",
@@ -60,7 +60,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 tests = [
     "approvaltests~=10.0",
-    "flake8~=6.0",
+    "flake8~=7.0",
     "pylint~=2.12",
     "pytest~=7.2",
     "pytest-cov~=4.0",