Updated vulnerable NuGet.* packages to 6.14.3

[xperiandri]

Proposed Changes

Enables Central Package Transitive Pinning (CentralPackageTransitivePinningEnabled) in Directory.Build.props so that all transitive NuGet dependencies are resolved exclusively from the versions declared in Directory.Packages.props. As a direct consequence, several vulnerable or outdated transitive packages are pinned explicitly: NuGet.Common and NuGet.Protocol are upgraded from 6.11.1 to 6.14.3, and NuGet.Packaging, System.Drawing.Common, and System.Formats.Asn1 are added as explicit version pins to satisfy security advisories. The SDK is updated to 10.0.300 and the legacy .sln file is replaced by the newer .slnx format. All GitHub Actions workflows are updated to their latest action versions.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• Build and tests pass locally
• I have added tests that prove my fix is effective or that my feature works (if appropriate) – not applicable; this is a dependency/tooling update with no logic changes
• I have added necessary documentation (if appropriate) – not applicable; no public API changes

Further comments

Transitive pinning is enforced by adding <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled> to Directory.Build.props. This requires that any transitive package whose resolved version must be overridden is listed explicitly in Directory.Packages.props – hence the addition of NuGet.Packaging, System.Drawing.Common, and System.Formats.Asn1 entries. Without these pins the build would fail under the new pinning policy.

[Copilot]

Pull request overview

This PR strengthens dependency and restore hygiene by moving the repo toward fully centrally-pinned package resolution, and updates specific NuGet-related packages to patched versions.

Changes:

• Enabled Central Package Transitive Pinning (CentralPackageTransitivePinningEnabled) to ensure transitive dependency versions are centrally governed.
• Updated NuGet.Common and NuGet.Protocol to 6.14.3 and added explicit pins for additional packages needed under the new pinning policy.

Reviewed changes

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

File	Description
Directory.Packages.props	Updates/pins NuGet-related and security-advisory-related package versions under central package management.
Directory.Build.props	Enables transitive pinning to enforce central version control for transitive restores.

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