build(deps): bump github.com/gorilla/mux from 1.8.0 to 1.8.1 (#1219)

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go.mod

@@ -7,7 +7,7 @@ require (
 	contrib.go.opencensus.io/exporter/ocagent v0.7.0
 	github.com/bombsimon/logrusr/v3 v3.1.0
 	github.com/google/go-cmp v0.6.0
-	github.com/gorilla/mux v1.8.0
+	github.com/gorilla/mux v1.8.1
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.16.0