build(deps): bump github.com/gorilla/mux from 1.7.3 to 1.7.4

Bumps [github.com/gorilla/mux](https://github.com/gorilla/mux) from 1.7.3 to 1.7.4.
- [Release notes](https://github.com/gorilla/mux/releases)
- [Commits](gorilla/mux@v1.7.3...v1.7.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

go.mod

@@ -38,7 +38,7 @@ require (
 	github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf
 	github.com/google/uuid v1.1.1
 	github.com/gorilla/handlers v1.4.2 // indirect
-	github.com/gorilla/mux v1.7.3
+	github.com/gorilla/mux v1.7.4
 	github.com/gorilla/schema v1.1.0
 	github.com/hashicorp/go-multierror v1.0.0
 	github.com/hpcloud/tail v1.0.0

go.sum

@@ -213,6 +213,8 @@ github.com/gorilla/handlers v1.4.2/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/
 github.com/gorilla/mux v0.0.0-20170217192616-94e7d24fd285/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/mux v1.7.4 h1:VuZ8uybHlWmqV03+zRzdwKL4tUnIp1MAQtp1mIFE1bc=
+github.com/gorilla/mux v1.7.4/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/schema v1.1.0 h1:CamqUDOFUBqzrvxuz2vEwo8+SUdwsluFh7IlzJh30LY=
 github.com/gorilla/schema v1.1.0/go.mod h1:kgLaKoK1FELgZqMAVxx/5cbj0kT+57qxUrAlIO2eleU=
 github.com/gotestyourself/gotestyourself v2.2.0+incompatible/go.mod h1:zZKM6oeNM8k+FRljX1mnzVYeS8wiGgQyvST1/GafPbY=