Bump comet-ml from 3.15.1 to 3.47.4

Bumps [comet-ml](https://www.comet.com) from 3.15.1 to 3.47.4.

---
updated-dependencies:
- dependency-name: comet-ml
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/test_requirements.txt

@@ -2,6 +2,6 @@ pytest==5.3.1
 pytest-cov==2.11.1
 transformers==4.9.2
 neptune_client==0.13.0
-comet_ml==3.15.1
+comet_ml==3.47.4
 wandb==0.10.27
 tensorboard==2.6.0