fix(deps): update module github.com/stackitcloud/stackit-sdk-go/core to v0.21.1 (#662)

Co-authored-by: ske-renovate-ce[bot] <163154779+ske-renovate-ce[bot]@users.noreply.github.com>

Author: ske-renovate-ce[bot]

go.mod

@@ -15,7 +15,7 @@ require (
 	github.com/prometheus/client_golang v1.23.2
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/pflag v1.0.10
-	github.com/stackitcloud/stackit-sdk-go/core v0.21.0
+	github.com/stackitcloud/stackit-sdk-go/core v0.21.1
 	github.com/stackitcloud/stackit-sdk-go/services/iaas v1.3.3
 	github.com/stackitcloud/stackit-sdk-go/services/loadbalancer v1.7.1
 	go.uber.org/mock v0.6.0

go.sum

@@ -190,8 +190,8 @@ github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
 github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stackitcloud/cloud-provider v0.33.2-ske-1 h1:5ul5l6h474fxSQm55OSHZoTtrwhO9mNjA1rEAik7Ugs=
 github.com/stackitcloud/cloud-provider v0.33.2-ske-1/go.mod h1:yS8ArLLLZV1+Tv6hkSYrZuYEVz+wQgiekUtaqe9Wxao=
-github.com/stackitcloud/stackit-sdk-go/core v0.21.0 h1:QXZqiaO7U/4IpTkJfzt4dt6QxJzG2uUS12mBnHpYNik=
-github.com/stackitcloud/stackit-sdk-go/core v0.21.0/go.mod h1:fqto7M82ynGhEnpZU6VkQKYWYoFG5goC076JWXTUPRQ=
+github.com/stackitcloud/stackit-sdk-go/core v0.21.1 h1:Y/PcAgM7DPYMNqum0MLv4n1mF9ieuevzcCIZYQfm3Ts=
+github.com/stackitcloud/stackit-sdk-go/core v0.21.1/go.mod h1:osMglDby4csGZ5sIfhNyYq1bS1TxIdPY88+skE/kkmI=
 github.com/stackitcloud/stackit-sdk-go/services/iaas v1.3.3 h1:h8qQwKLk7hACUfk4I25Lh8R1PmVXsaAKAEId5zQfoe4=
 github.com/stackitcloud/stackit-sdk-go/services/iaas v1.3.3/go.mod h1:CLhEsGMRegm/F8KGr2/QFmhOelfBsaaoczcsGU1vINQ=
 github.com/stackitcloud/stackit-sdk-go/services/loadbalancer v1.7.1 h1:2UKKtBg+E5IFUcZAkRyKz1Km+tsA//zGjFQjVWwaXss=