bump versions of chatbot dependencies

chatbot/python/requirements.txt

@@ -1,3 +1,3 @@
 futures>=3.2.0; python_version<'3'
-grpcio>=1.18.0
-tinode-grpc>=0.16
+grpcio>=1.40.0
+tinode-grpc>=0.18

chatbot/python/setup.py

@@ -14,7 +14,7 @@ setuptools.setup(
     long_description_content_type="text/markdown",
     url="https://github.com/tinode/chat",
     packages=setuptools.find_packages(),
-    install_requires=['grpcio>=1.15.0'],
+    install_requires=['grpcio>=1.40.0'],
     classifiers=(
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: Apache 2.0",

tn-cli/requirements.txt

@@ -1,5 +1,5 @@
 futures>=3.2.0; python_version<'3'
-grpcio>=1.19.0
+grpcio>=1.40.0
 Pillow>=5.4.1
 requests>=2.21.0
 tinode-grpc>=0.18.0