SK .NET Release version bump

[westey-m]

Motivation and Context

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[Copilot]

Pull request overview

This pull request bumps the .NET NuGet release versions used by the repo, updating both the central SK package version prefix and the standalone VectorData.Abstractions package versioning and validation baseline.

Changes:

• Update central NuGet VersionPrefix from 1.73.0 to 1.74.0 and advance its package validation baseline to 1.73.0.
• Bump Microsoft.Extensions.VectorData.Abstractions package version from 10.0.1 to 10.1.0 and advance its package validation baseline to 10.0.1.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
dotnet/src/VectorData/VectorData.Abstractions/VectorData.Abstractions.csproj	Updates VectorData.Abstractions package version and its NuGet validation baseline.
dotnet/nuget/nuget-package.props	Updates the central SK version prefix and baseline used for package validation.

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