`--channel=latest/edge` is outdated vs `stable` for the Preview package.

[RokeJulianLockhart]

1. Prerequisites

   • [X] Write a descriptive title.
   • [X] Make sure you are able to repro it on the latest version
   • [X] Search the existing issues.

2. Steps to reproduce

   https://snapcraft.io/powershell-preview#:~:text=MIT-,last%20updated,-16%20November%202023 states

   16 November 2023 - latest/stable
   3 May 2023 - latest/edge

3. Expected behavior

   --channel=latest/edge should always be on the latest version, whether that version is also stable or not.

4. Actual behavior

   It hasn't been updated since +2023-05-03, whereas --channel=latest/stable was last updated on +2023-11-16.

5. Error details

   RokeJulianLockhart@s1e8h4:~> snap run powershell-preview
   PowerShell 7.4.0-preview.3
   
   A new PowerShell stable release is available: v7.4.0 
   Upgrade now, or check out the release page at:       
   	https://aka.ms/PowerShell-Release?tag=v7.4.0       
   
   PS /home/RokeJulianLockhart>
   

6. Environment data

   PS /home/RokeJulianLockhart> $PSVersionTable
   
   Name                           Value
   ----                           -----
   PSVersion                      7.4.0-preview.3
   PSEdition                      Core
   GitCommitId                    7.4.0-preview.3
   OS                             Linux 6.6.3-1-default #1 SMP PREEMPT_DYNAMIC Wed Nov 29 05:06:07 UTC 2023 (d766c57)
   Platform                       Unix
   PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
   PSRemotingProtocolVersion      2.3
   SerializationVersion           1.1.0.1
   WSManStackVersion              3.0
   
   PS /home/RokeJulianLockhart>
   

7. Version

   latest/edge: 7.4.0-preview.3 2023-05-03 (142) 72MB classic

8. Visuals