maintenance(ot): align package CI validation

[github-actions]

Generated by the maintenance inventory on 2026-07-27T06:27:48Z.

Summary

CI SDK bands should match the package target framework policy.

Findings

• .github/workflows/egil-orleans-testing-ci.yml hard-codes setup-dotnet SDK versions; verify they still match the retained TFMs.

Suggested Agent Task

• Inspect the current package, SDK, workflow, or test-harness docs before changing code.
• Make one focused PR for this issue.
• Keep package release-note conventions intact; use [skip notes] for internal maintenance if needed.

Acceptance Criteria

• CI SDK versions match the target frameworks retained by the package.