Upgrade local windows tensorflow version (#2246)

test/pipelines/pipelines-it-local-windows.yml

@@ -10,7 +10,7 @@ jobs:
       python -m pip install scikit-learn==0.20.0 --user
       python -m pip install keras==2.1.6 --user
       python -m pip install torchvision===0.4.1 torch===1.3.1 -f https://download.pytorch.org/whl/torch_stable.html --user
-      python -m pip install tensorflow-gpu==1.11.0 --user
+      python -m pip install tensorflow-gpu==1.15.2 --user
     displayName: 'Install dependencies for integration tests'
   - script: |
       cd test