Bump github.com/google/go-cmp from 0.4.1 to 0.5.6

Bumps [github.com/google/go-cmp](https://github.com/google/go-cmp) from 0.4.1 to 0.5.6.
- [Release notes](https://github.com/google/go-cmp/releases)
- [Commits](google/go-cmp@v0.4.1...v0.5.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -15,7 +15,7 @@ require (
 	github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737
 	github.com/go-kit/kit v0.9.0
 	github.com/golang/protobuf v1.4.2
-	github.com/google/go-cmp v0.4.1
+	github.com/google/go-cmp v0.5.6
 	github.com/gorilla/context v1.1.1
 	github.com/gorilla/handlers v1.4.2
 	github.com/gorilla/mux v1.7.4

go.sum

@@ -169,6 +169,7 @@ github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.4.1 h1:/exdXoGamhu5ONeUJH0deniYLWYvQwW66yvlfiiKTu0=
 github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/martian v2.1.0+incompatible h1:/CP5g8u/VJHijgedC/Legn3BAbAaWPgecwXBIDzw5no=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57 h1:eqyIo2HjKhKe/mJzTG8n4VqvLXIOEG+SLdDqX7xGtkY=