Update dependency tensorflow to v2.8.1 [SECURITY]

Author: renovate[bot]

wandb/run-20230628_212921-2mmurnjq/files/requirements.txt

@@ -427,7 +427,7 @@ tensorflow-datasets==4.5.2
 tensorflow-hub==0.12.0
 tensorflow-io-gcs-filesystem==0.24.0
 tensorflow-metadata==1.8.0
-tensorflow==2.8.0
+tensorflow==2.8.1
 tensorrt==0.0.1
 termcolor==1.1.0
 terminado==0.13.1