Bumps github.com/stackitcloud/stackit-sdk-go/core from 0.17.3 to 0.21.0.

Sourced from github.com/stackitcloud/stackit-sdk-go/core's changelog.

Release (2026-XX-YY)

• loadbalancer: v1.7.0
  • Feature: Add new fields MaxCredentials, UsedCredentials and UsedLoadBalancers in GetQuotaResponse Model
• ske: v1.6.0
  • Feature: Add field Identity to model ClusterStatus
• observability: v0.16.0
  • Breaking change: The PartialUpdateAlertrules takes now PartialUpdateAlertrulesRequestInner instead of UpdateAlertgroupsRequestInnerRulesInner.
  • Breaking change: The type of Rules in CreateLogsAlertgroupsPayload and UpdateLogsAlertgroupPayload has changed from []UpdateAlertgroupsRequestInnerRulesInner to []CreateLogsAlertgroupsPayloadRulesInner.
  • Deprecation: The GrafanaAdminPassword and GrafanaAdminUser fields are now deprecated in InstanceSensitiveData model
  • Feature: Add GrafanaAdminEnabled to CreateInstancePayload and UpdateInstancePayload models.
  • Feature: Add new field record in UpdateAlertgroupsRequestInnerRulesInner model
  • Feature: Add CertCheck to CertCheckResponse model.
  • Feature: Add HttpCheck to HttpCheckResponse model.
  • Feature: Add new CreateLogsAlertgroupsPayloadRulesInner model.
  • Feature: Add allowAssignGrafanaAdmin to GrafanaOauth and UpdateGrafanaConfigsPayloadGenericOauth models.
  • Feature: Add GrafanaAdminEnabled to InstanceSensitiveData model.
  • Feature: Add new PartialUpdateAlertrulesRequestInner model.
• secretsmanager: v0.14.0
  • Feature: added KmsKey model
  • Feature: added KmsKey to Instance, CreateInstancePayload and UpdateInstancePayload
• edge:
  • v0.4.0
    • Deprecation: Deprecated API method ListPlansGlobal
  • v0.3.0
    • Breaking change: Rename methods: PostInstances to CreateInstance and GetInstances to ListInstances
  • v0.2.0
    • Feature: Add waiter methods for the API
  • v0.1.0
    • New: STACKIT Edge Cloud service
• alb:
  • v0.9.0
    • Feature: Add new fields UsedCredentials and UsedLoadBalancers in GetQuotaResponse model
  • v0.8.0
    • Feature: Switch from v2beta API version to v2 version.
    • Feature: MaxCredentials field added to GetQuotaResponse
    • Breaking change: added version to LoadBalancer constructor
    • Breaking change: renamed exact to exactMatch in Path model
    • Breaking change: removed pathPrefix from Rule model
• certificates: v1.2.0
  • Feature: Switch from v2beta API version to v2 version.
  • Breaking change: Rename CreateCertificateResponse to GetCertificateResponse
• core:
  • v0.21.0
    • Deprecation: KeyFlow SetToken and GetToken will be removed after 2026-07-01. Use GetAccessToken instead and rely on client refresh.
    • Feature: Support Workload Identity Federation flow
• sfs:
  • v0.2.0
    • Breaking change: Remove region configuration in APIClient
  • v0.1.0
    • New: STACKIT File Storage (SFS) service

... (truncated)

• 848cf95 feat: Support workload identity federation flow (#4074)
• e284bdf Generator: Update SDK /services/runcommand (#4224)
• 60aae05 Generator: Update SDK /services/serverbackup (#4219)
• a5e793b Update module github.com/stackitcloud/stackit-sdk-go/services/loadbalancer to...
• f9c72f3 Generator: Update SDK /services/alb (#4210)
• 360d8f9 Generator: Update SDK /services/loadbalancer (#4211)
• 8ce9fe4 Update module github.com/stackitcloud/stackit-sdk-go/services/ske to v1.6.0 (...
• 9fdc3b0 feat(ci) also run on go 1.24, 1.25 (#4206)
• fcc2c64 Generator: Update SDK /services/ske (#4204)
• a03e63d Feat/stackittpr 442 depedency cooldowns (#4201)
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