[release/9.0] Update branding to 9.0.21

[vseanreesermsft]

This PR updates version branding on branch release/9.0.

Changes:

• Repository: runtime
  • PatchVersion: 20 -> 21

Files Modified:

• eng/Versions.props (+2 -2)

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Pull request overview

Updates the .NET 9.0 servicing branding/version constants for the release/9.0 branch to reflect the 9.0.21 patch release.

Changes:

• Bump ProductVersion from 9.0.20 to 9.0.21.
• Bump PatchVersion from 20 to 21 to keep file/product versioning consistent.

File summaries

File	Description
eng/Versions.props	Updates branding and patch version values to 9.0.21.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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