Bump flask from 2.2.5 to 3.1.3 in /test/sagemaker_tests/pytorch/training (#6)

Automatic merge of Dependabot PR

Author: dependabot[bot]

test/sagemaker_tests/pytorch/training/requirements.txt

@@ -5,7 +5,7 @@ protobuf
 sagemaker>=2.180.0
 coverage
 flake8==3.7.7
-Flask==2.2.5
+Flask==3.1.3
 mock==2.0.0
 # Preserve pytest caching behavior in earlier versions
 pytest<8.1