Generator: Update SDK /services/observability - #12501

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Restore cache failed: Dependencies file is not found in /Users/runner/work/stackit-sdk-go/stackit-sdk-go. Supported file pattern: go.sum