chore(deps): update module github.com/gorilla/mux to v1.8.1

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gopherjs/gopherjs v0.0.0-20210803090616-8f023c250c89 // indirect
 	github.com/gorilla/context v1.1.1 // indirect
-	github.com/gorilla/mux v1.3.1-0.20170228224354-599cba5e7b61 // indirect
+	github.com/gorilla/mux v1.8.1 // indirect
 	github.com/gorilla/websocket v1.4.2 // indirect
 	github.com/ian-kent/goose v0.0.0-20141221090059-c3541ea826ad // indirect
 	github.com/ian-kent/linkio v0.0.0-20141229112453-77fb4b01842c // indirect

go.sum

@@ -73,8 +73,8 @@ github.com/gopherjs/gopherjs v0.0.0-20210803090616-8f023c250c89 h1:cuZTXJQ2J5mpT
 github.com/gopherjs/gopherjs v0.0.0-20210803090616-8f023c250c89/go.mod h1:0RnbP5ioI0nqRf3R9iK3iQaUJgsn0htlZEHCMn8FSfw=
 github.com/gorilla/context v1.1.1 h1:AWwleXJkX/nhcU9bZSnZoi3h/qGYqQAGhq6zZe/aQW8=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
-github.com/gorilla/mux v1.3.1-0.20170228224354-599cba5e7b61 h1:fgQcA2gW8X1dLTYeaO8N6d1UMxsHczPYRjITrFNjxhk=
-github.com/gorilla/mux v1.3.1-0.20170228224354-599cba5e7b61/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
 github.com/gorilla/pat v1.0.1 h1:OeSoj6sffw4/majibAY2BAUsXjNP7fEE+w30KickaL4=
 github.com/gorilla/pat v1.0.1/go.mod h1:YeAe0gNeiNT5hoiZRI4yiOky6jVdNvfO2N6Kav/HmxY=
 github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=