[Update Request]: Dell Command Update

### What type of update are you requesting?

A new version of an existing package

### Current Package Identifier

Dell.CommandUpdate

### Package Version

5.7.1

### Please describe the changes you would like to see

There is a new version of Dell Command Update available as of August 18th. Latest version is now 5.7.1

https://www.dell.com/support/kbdoc/en-us/000501378/dsa-2026-309-security-update-for-dell-command-update-for-multiple-vulnerabilities

Start with the Dell.CommandUpdate package identifier and verify the Dell support advisory linked in the issue for the 5.7.1 release. Update the package metadata to represent version 5.7.1, then confirm the manifest passes the repository’s validation checks.

Written by the indexing model from the issue text.