Upgrade gRPC version used in OSS. Fix-forward of #14262. Remove namespace-compatibility hack.

PiperOrigin-RevId: 175586521
diff --git a/configure.py b/configure.py
index 51d8608..0d1afbf 100644
--- a/configure.py
+++ b/configure.py
@@ -976,6 +976,10 @@
   write_to_bazelrc('build:android_arm64 --cpu=arm64-v8a')
 
 
+def set_grpc_build_flags():
+  write_to_bazelrc('build --define grpc_no_ares=true')
+
+
 def main():
   # Make a copy of os.environ to be clear when functions and getting and setting
   # environment variables.
@@ -1043,6 +1047,7 @@
     set_mpi_home(environ_cp)
     set_other_mpi_vars(environ_cp)
 
+  set_grpc_build_flags()
   set_cc_opt_flags(environ_cp)
   set_mkl()
   set_monolithic()