Update colorlog requirement from ~=6.8 to ~=6.9

Updates the requirements on [colorlog](https://github.com/borntyping/python-colorlog) to permit the latest version.
- [Release notes](https://github.com/borntyping/python-colorlog/releases)
- [Commits](borntyping/python-colorlog@v6.8.0...v6.9.0)

---
updated-dependencies:
- dependency-name: colorlog
  dependency-type: direct:development
...

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

requirements-dev.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 pre-commit~=3.7
 ruff~=0.4
-colorlog~=6.8
+colorlog~=6.9
 pvlib~=0.11
 matplotlib~=3.9
 ipykernel~=6.29