Bump versions of absl-py, tf-mot, and grpcio to newer versions required by

TF-nightly  (2.5.0)

PiperOrigin-RevId: 340451437

Dockerfile

@@ -58,17 +58,17 @@ RUN bazel version
 
 # Install the TensorFlow Federated development environment dependencies
 RUN ${PIP} install --no-cache-dir --upgrade \
-    absl-py~=0.9.0 \
+    absl-py~=0.11.0 \
     attrs~=19.3.0 \
     cachetools~=3.1.1 \
     dm-tree~=0.1.1 \
-    grpcio~=1.29.0 \
+    grpcio~=1.32.0 \
     h5py~=2.10.0 \
     numpy~=1.18.4 \
     portpicker~=1.3.1 \
     retrying~=1.3.3 \
     semantic-version~=2.8.5 \
-    tensorflow-model-optimization~=0.4.0 \
+    tensorflow-model-optimization~=0.5.0 \
     tensorflow-privacy~=0.5.0 \
     tf-nightly \
     tfa-nightly

requirements.txt

 # Requirements for TensorFlow Federated development. If you add a requirement
 # here, also add it to the Dockerfile and (if it is needed by the PIP package)
 # to tools/development/setup.py.
-absl-py~=0.9.0
+absl-py~=0.11.0
 attrs~=19.3.0
 cachetools~=3.1.1
 dm-tree~=0.1.1
-grpcio~=1.29.0
+grpcio~=1.32.0
 h5py~=2.10.0
 numpy~=1.18.4
 portpicker~=1.3.1
 retrying~=1.3.3
 semantic-version~=2.8.5
-tensorflow-model-optimization~=0.4.0
+tensorflow-model-optimization~=0.5.0
 tensorflow-privacy~=0.5.0
 tf-nightly
 tfa-nightly