Remove deprecated test_tube dependency (#14513)

Author: carmocca

requirements/pytorch/loggers.txt

@@ -6,5 +6,4 @@
 neptune-client>=0.10.0, <0.16.4
 comet-ml>=3.1.12, <3.31.8
 mlflow>=1.0.0, <1.29.0
-test_tube>=0.7.5, <=0.7.5
 wandb>=0.10.22, <0.13.2