Update module github.com/gorilla/websocket to v1.5.3

Author: renovate[bot]

go.mod

@@ -18,7 +18,7 @@ replace (
 	// removing them we would need to import them somewhere in the code.
 	// See: https://github.com/golang/go/issues/37352
 	github.com/coreos/etcd => github.com/coreos/etcd v3.3.27+incompatible
-	github.com/gorilla/websocket => github.com/gorilla/websocket v1.4.2
+	github.com/gorilla/websocket => github.com/gorilla/websocket v1.5.3
 	github.com/labstack/echo/v4 => github.com/labstack/echo/v4 v4.2.0
 	golang.org/x/text => golang.org/x/text v0.3.5
 )

go.sum

@@ -48,6 +48,7 @@ github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/hashicorp/go-version v1.2.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=