requirements: Update grpcio to 1.51.1

This is required to support Python 3.11.
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index e8dd97c..3c621fb 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -1,5 +1,5 @@
 click==8.1.3
-grpcio==1.46.0
+grpcio==1.51.1
 Jinja2==3.1.2
 pluginbase==1.0.1
 protobuf==4.21.12