Update module github.com/stackitcloud/stackit-sdk-go/services/iaas to v1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/stackitcloud/stackit-sdk-go/services/iaas (changelog)	v0.31.0 → v1.11.1

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 2 additional dependencies were updated

Details:

Package	Change
github.com/stackitcloud/stackit-sdk-go/core	v0.17.3 -> v0.26.0
github.com/golang-jwt/jwt/v5	v5.3.0 -> v5.3.1