Upgrade tensorflow to version to 2.6.x

Upgrade the following versions:
keras - from 2.4.3 to 2.6
tensorflow - from 2.4.2 to 2.6.2
h5py - from version < 3.0 to version 3.1.0

Author: ophirfrish

docker/install/ubuntu_install_tensorflow.sh

@@ -21,6 +21,6 @@ set -u
 set -o pipefail
 
 pip3 install \
-    "h5py<3.0" \
-    keras==2.4.3 \
-    tensorflow==2.4.2
+    "h5py==3.1.0" \	
+    keras==2.6 \
+    tensorflow==2.6.2