Increase the Python protobuf requirement to >=3.12.0 (#28604)

src/python/grpcio_channelz/setup.py

@@ -63,7 +63,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.6.0',
+    'protobuf>=3.12.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 

src/python/grpcio_csds/setup.py

@@ -39,7 +39,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.6.0',
+    'protobuf>=3.12.0',
     'xds-protos>=0.0.7',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )

src/python/grpcio_health_checking/setup.py

@@ -62,7 +62,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.6.0',
+    'protobuf>=3.12.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 

src/python/grpcio_reflection/setup.py

@@ -63,7 +63,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.6.0',
+    'protobuf>=3.12.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 

src/python/grpcio_status/setup.py

@@ -62,7 +62,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.6.0',
+    'protobuf>=3.12.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
     'googleapis-common-protos>=1.5.5',
 )

src/python/grpcio_testing/setup.py

@@ -49,7 +49,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.6.0',
+    'protobuf>=3.12.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 

src/python/grpcio_tests/setup.py

@@ -42,7 +42,7 @@ INSTALL_REQUIRES = (
     'grpcio-status>={version}'.format(version=grpc_version.VERSION),
     'grpcio-tools>={version}'.format(version=grpc_version.VERSION),
     'grpcio-health-checking>={version}'.format(version=grpc_version.VERSION),
-    'oauth2client>=1.4.7', 'protobuf>=3.6.0', 'six>=1.10',
+    'oauth2client>=1.4.7', 'protobuf>=3.12.0', 'six>=1.10',
     'google-auth>=1.17.2', 'requests>=2.14.2')
 
 if not PY3: