lift tensorboard version restriction (#8765)

Author: awaelchli

requirements.txt

@@ -6,7 +6,7 @@ future>=0.17.1  # required for builtins in setup.py
 tqdm>=4.41.0
 PyYAML>=5.1
 fsspec[http]>=2021.05.0, !=2021.06.0
-tensorboard>=2.2.0, !=2.5.0  # 2.5.0 GPU CI error: 'Couldn't build proto file into descriptor pool!'
+tensorboard>=2.2.0
 torchmetrics>=0.4.1
 pyDeprecate==0.3.1
 packaging>=17.0