Update proteinflow requirement from ~=2.4.0 to ~=2.8.0

Updates the requirements on [proteinflow]() to permit the latest version.

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

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

requirements.txt

@@ -28,7 +28,7 @@ rich~=13.3.5
 pytest~=7.4.2
 # sh            # for running bash commands in some tests (linux/macos only)
 
-proteinflow~=2.4.0
+proteinflow~=2.8.0
 omegaconf~=2.3.0
 packaging~=21.3
 setuptools~=41.2.0