Update flake8 requirement from <7.0.0,>=6.0.0 to >=6.0.0,<8.0.0

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:development
...

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

setup.py

@@ -66,7 +66,7 @@
             "timm<1.0.0",
             "transformers<5.0.0",
             "black>=23.7.0,<25.0.0",
-            "flake8>=6.0.0,<7.0.0",
+            "flake8>=6.0.0,<8.0.0",
         ],
         "geo": [
             "cartopy>=0.20.0"