Update SDK version to 10.0.28000.1721

Author: hamza-usmani

hub/apps/windows-sdk/downloads.md

@@ -17,7 +17,7 @@ For older versions, see the [Windows SDK download archive](downloads-archive.md)
 
 | Release  | Downloads |
 | ----- | -------------------------------------- |
-| **Windows SDK for Windows 11 (10.0.28000.0)** <br/> March 2026 <br/> [Release notes](./release-notes.md#build-10028000) | [Installer](https://go.microsoft.com/fwlink/?linkid=2357925) <br/> [ISO](https://go.microsoft.com/fwlink/?linkid=2357642) |
+| **Windows SDK for Windows 11 (10.0.28000.1721)** <br/> March 2026 <br/> [Release notes](./release-notes.md#build-100280001721) | [Installer](https://go.microsoft.com/fwlink/?linkid=2357925) <br/> [ISO](https://go.microsoft.com/fwlink/?linkid=2357642) |
 | **Windows SDK for Windows 11 (10.0.26100.7705)** <br/> February 2026 <br/> [Release notes](./release-notes.md#build-100261007705) | [Installer](https://go.microsoft.com/fwlink/?linkid=2349110) <br/> [ISO](https://go.microsoft.com/fwlink/?linkid=2348707) |
 | **Windows SDK for Windows 11 (10.0.26100.7627)** <br/> January 2026 <br/> [Release notes](./release-notes.md#build-100261007627) | [Installer]( https://go.microsoft.com/fwlink/?linkid=2347650) <br/> [ISO](https://go.microsoft.com/fwlink/?linkid=2347553) |
 | **Windows SDK for Windows 11 (10.0.26100.7463)** <br/> December 2025 <br/> [Release notes](./release-notes.md#build-100261007463) | [Installer](https://go.microsoft.com/fwlink/?linkid=2346012) <br/> [ISO](https://go.microsoft.com/fwlink/?linkid=2345534) |

hub/apps/windows-sdk/release-notes.md

@@ -14,7 +14,7 @@ You can update the SDK by manually installing the new build, updating in Visual
 
 For the the latest builds, see [Downloads for the Windows SDK](./downloads.md).
 
-## Build 10.0.28000.0
+## Build 10.0.28000.1721
 
 Released: **March, 2026** <br><br>