mod+kvdb: update etcd to v3.5.0

.github/workflows/main.yml

@@ -249,8 +249,8 @@ jobs:
       fail-fast: false
       matrix:
         pinned_dep:
-          - google.golang.org/grpc v1.29.1
-          - github.com/golang/protobuf v1.4.3
+          - google.golang.org/grpc v1.38.0
+          - github.com/golang/protobuf v1.5.2
 
     steps:
       - name: git checkout