chore(deps): update module sigs.k8s.io/structured-merge-diff/v4 to v7 (#228)

* chore(deps): update module sigs.k8s.io/structured-merge-diff/v4 to v7

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

* chore(deps): remove deprecated replace

statements for sigs.k8s.io/structured-merge-diff

---------

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Simon Stier <simon.stier@digits.schwarz>

Author: renovate[bot]

go.mod

@@ -6,8 +6,6 @@ go 1.27.1
 // please place any replace statements here at the top for visibility and add a
 // comment to it as to when it can be removed
 
-replace sigs.k8s.io/structured-merge-diff/v4 => sigs.k8s.io/structured-merge-diff/v4 v4.7.0
-
 require (
 	github.com/cert-manager/cert-manager v1.21.2
 	github.com/stackitcloud/stackit-sdk-go/core v0.27.1