Bump github.com/gorilla/mux from 1.7.3 to 1.7.4 in /executor

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>

executor/go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/go-logr/logr v0.1.0
 	github.com/golang/protobuf v1.3.5
 	github.com/google/uuid v1.1.1
-	github.com/gorilla/mux v1.7.3
+	github.com/gorilla/mux v1.7.4
 	github.com/grpc-ecosystem/go-grpc-middleware v1.1.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/onsi/gomega v1.8.1

executor/go.sum

@@ -229,6 +229,8 @@ github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51
 github.com/gorilla/mux v1.6.2/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/mux v1.7.4 h1:VuZ8uybHlWmqV03+zRzdwKL4tUnIp1MAQtp1mIFE1bc=
+github.com/gorilla/mux v1.7.4/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v0.0.0-20170926233335-4201258b820c/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=