chore(deps): bump github.com/gorilla/mux from 1.7.2 to 1.7.3 (#797)

Bumps [github.com/gorilla/mux](https://github.com/gorilla/mux) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/gorilla/mux/releases)
- [Commits](gorilla/mux@v1.7.2...v1.7.3)

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

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/dsnet/compress v0.0.1 // indirect
 	github.com/golang/protobuf v1.3.1 // indirect
 	github.com/golang/snappy v0.0.1 // indirect
-	github.com/gorilla/mux v1.7.2
+	github.com/gorilla/mux v1.7.3
 	github.com/gorilla/websocket v1.4.0
 	github.com/hacdias/fileutils v0.0.0-20181202104838-227b317161a1
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect

go.sum

@@ -74,6 +74,8 @@ github.com/gorilla/mux v1.7.1 h1:Dw4jY2nghMMRsh1ol8dv1axHkDwMQK2DHerMNJsIpJU=
 github.com/gorilla/mux v1.7.1/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.2 h1:zoNxOV7WjqXptQOVngLmcSQgXmgk4NMz1HibBchjl/I=
 github.com/gorilla/mux v1.7.2/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/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=