.NET: Update version for dotnet release 1.11.0

[peibekwe]

Motivation & Context

Updating version for dotnet release 1.11.0

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

[Copilot]

Pull request overview

Updates the .NET/NuGet packaging metadata to prepare the repository for the 1.11.0 release by bumping the centralized version values used across all .NET packages.

Changes:

• Bumped VersionPrefix from 1.10.0 to 1.11.0.
• Updated DateSuffix to 260622 to reflect the current build date suffix.
• Updated GitTag to 1.11.0 to align with the new release version.

[github-actions]

Automated Code Review

Reviewers: 5 | Confidence: 95% | Result: All clear

Reviewed: Correctness, Security Reliability, Test Coverage, Failure Modes, Design Approach

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Automated review by peibekwe's agents

[github-actions]

Automated Code Review

Reviewers: 5 | Confidence: 96% | Result: All clear

Reviewed: Correctness, Security Reliability, Test Coverage, Failure Modes, Design Approach

---

Automated review by peibekwe's agents