Update module sigs.k8s.io/structured-merge-diff/v6 to v6.4.2 (release-5.5) (#10389)

Update module sigs.k8s.io/structured-merge-diff/v6 to v6.4.2

| datasource | package                              | from   | to     |
| ---------- | ------------------------------------ | ------ | ------ |
| go         | sigs.k8s.io/structured-merge-diff/v6 | v6.4.1 | v6.4.2 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -29,7 +29,7 @@ require (
 	k8s.io/code-generator v0.36.2
 	k8s.io/utils v0.0.0-20260707023825-cf1189d6abe3
 	sigs.k8s.io/controller-tools v0.21.0
-	sigs.k8s.io/structured-merge-diff/v6 v6.4.1
+	sigs.k8s.io/structured-merge-diff/v6 v6.4.2
 	sigs.k8s.io/yaml v1.6.0
 )
 

go.sum

@@ -587,7 +587,7 @@ sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5E
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
 sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=
 sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY=
-sigs.k8s.io/structured-merge-diff/v6 v6.4.1 h1:AkER7js0XVWi/F/V2Iwl5N7O/B9VP2JyrOMmHPdco+g=
-sigs.k8s.io/structured-merge-diff/v6 v6.4.1/go.mod h1:M3W8sfWvn2HhQDIbGWj3S099YozAsymCo/wrT5ohRUE=
+sigs.k8s.io/structured-merge-diff/v6 v6.4.2 h1:qdOxHwrl2Kaag1aQEarlYcOA9vSyGCp3CIki3aW8c4Q=
+sigs.k8s.io/structured-merge-diff/v6 v6.4.2/go.mod h1:M3W8sfWvn2HhQDIbGWj3S099YozAsymCo/wrT5ohRUE=
 sigs.k8s.io/yaml v1.6.0 h1:G8fkbMSAFqgEFgh4b1wmtzDnioxFCUgTZhlbj5P9QYs=
 sigs.k8s.io/yaml v1.6.0/go.mod h1:796bPqUfzR/0jLAl6XjHl3Ck7MiyVv8dbTdyT3/pMf4=