chore(deps): bump sigs.k8s.io/gateway-api from 1.3.0 to 1.4.0 in /test

Bumps [sigs.k8s.io/gateway-api](https://github.com/kubernetes-sigs/gateway-api) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/kubernetes-sigs/gateway-api/releases)
- [Changelog](https://github.com/kubernetes-sigs/gateway-api/blob/main/RELEASE.md)
- [Commits](kubernetes-sigs/gateway-api@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: sigs.k8s.io/gateway-api
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

test/go.mod

@@ -19,7 +19,7 @@ require (
 	k8s.io/client-go v0.34.1
 	sigs.k8s.io/controller-runtime v0.22.1
 	sigs.k8s.io/external-dns v0.17.0
-	sigs.k8s.io/gateway-api v1.3.0
+	sigs.k8s.io/gateway-api v1.4.0
 )
 
 require (

test/go.sum

@@ -281,8 +281,8 @@ sigs.k8s.io/controller-runtime v0.22.1 h1:Ah1T7I+0A7ize291nJZdS1CabF/lB4E++WizgV
 sigs.k8s.io/controller-runtime v0.22.1/go.mod h1:FwiwRjkRPbiN+zp2QRp7wlTCzbUXxZ/D4OzuQUDwBHY=
 sigs.k8s.io/external-dns v0.17.0 h1:lBhJmGWvezR/HZcIAW6j8fVw2LczXFEGs5BluUMmFaM=
 sigs.k8s.io/external-dns v0.17.0/go.mod h1:CTN8maaP4nrMvmC9O00YBUfFIzkDp6Ka9MZvsCZbS38=
-sigs.k8s.io/gateway-api v1.3.0 h1:q6okN+/UKDATola4JY7zXzx40WO4VISk7i9DIfOvr9M=
-sigs.k8s.io/gateway-api v1.3.0/go.mod h1:d8NV8nJbaRbEKem+5IuxkL8gJGOZ+FJ+NvOIltV8gDk=
+sigs.k8s.io/gateway-api v1.4.0 h1:ZwlNM6zOHq0h3WUX2gfByPs2yAEsy/EenYJB78jpQfQ=
+sigs.k8s.io/gateway-api v1.4.0/go.mod h1:AR5RSqciWP98OPckEjOjh2XJhAe2Na4LHyXD2FUY7Qk=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5EXP7sU1kvOlxwZh5txg=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
 sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=