fix(deps): update stackit sdk modules

[stackit-pipeline]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/stackitcloud/stackit-sdk-go/services/iaas	v0.27.1 -> v0.29.0
github.com/stackitcloud/stackit-sdk-go/services/mongodbflex	v1.5.1 -> v1.5.2
github.com/stackitcloud/stackit-sdk-go/services/observability	v0.9.1 -> v0.10.0
github.com/stackitcloud/stackit-sdk-go/services/serviceaccount	v0.9.1 -> v0.11.0

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[github-actions]

Merging this branch changes the coverage (1 decrease, 1 increase)

Impacted Packages	Coverage Δ	🤖
github.com/stackitcloud/stackit-cli/internal/cmd/image/list	36.84% (-0.49%)	👎
github.com/stackitcloud/stackit-cli/internal/cmd/volume/list	42.86% (+0.92%)	👍

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/stackitcloud/stackit-cli/internal/cmd/image/list/list.go	36.84% (-0.49%)	76 (+1)	28	48 (+1)	👎
github.com/stackitcloud/stackit-cli/internal/cmd/volume/list/list.go	42.86% (+0.92%)	63 (+1)	27 (+1)	36	👍

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.