[Update Request]: Remote Desktop Connection Manager

### What type of update are you requesting?

A new version of an existing package

### Current Package Identifier

Microsoft.Sysinternals.RDCMan

### Package Version

3.20

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

There is a new release (3.20) available.
Download Page Url: https://learn.microsoft.com/en-us/sysinternals/downloads/rdcman?WT.mc_id=DT-MVP-4015686

Locate the manifest for Microsoft.Sysinternals.RDCMan in the winget-pkgs repository and review the release details at the linked download page. Update the existing package metadata for version 3.20, then validate the manifest using the repository's standard checks; done means the manifest reflects the new release and passes validation.

Written by the indexing model from the issue text.