Update module github.com/stackitcloud/stackit-sdk-go/core to v0.26.0 (release-v1.33)#928

ske-prow[bot] merged 1 commit intorelease-v1.33stackitcloud/cloud-provider-stackit:release-v1.33from

renovate/release-v1.33-github.com-stackitcloud-stackit-sdk-go-core-0.xstackitcloud/cloud-provider-stackit:renovate/release-v1.33-github.com-stackitcloud-stackit-sdk-go-core-0.xCopy head branch name to clipboard