chore(deps): update etcd client to 3.5

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

go.mod

@@ -10,8 +10,7 @@ require (
 	github.com/felixge/httpsnoop v1.0.1
 	github.com/ghodss/yaml v1.0.0
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/gogo/protobuf v1.3.1 // indirect
-	github.com/golang/protobuf v1.3.2
+	github.com/golang/protobuf v1.4.3
 	github.com/gorilla/handlers v1.5.1
 	github.com/gorilla/mux v1.8.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
@@ -23,18 +22,18 @@ require (
 	github.com/onsi/ginkgo v1.8.0 // indirect
 	github.com/onsi/gomega v1.5.0 // indirect
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.4.0
+	github.com/prometheus/client_golang v1.5.1
 	github.com/russellhaering/goxmldsig v1.1.0
 	github.com/sirupsen/logrus v1.8.0
 	github.com/spf13/cobra v1.1.3
 	github.com/stretchr/testify v1.7.0
-	go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738
+	go.etcd.io/etcd/client/v3 v3.5.0-alpha.0
+	go.etcd.io/etcd/pkg/v3 v3.5.0-alpha.0
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
 	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3 // indirect
-	google.golang.org/api v0.15.0
-	google.golang.org/grpc v1.26.0
+	golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5
+	google.golang.org/api v0.35.0
+	google.golang.org/grpc v1.32.0
 	gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d // indirect
 	gopkg.in/ldap.v2 v2.5.1
 	gopkg.in/square/go-jose.v2 v2.5.1