ddu: Change checkver to mirror

[404NetworkError]

• I have read the Contributing Guide.

---

Also downgrades the version because a version bump occurred in the AssemblyInfo.vb file, but a binary hadn't been released yet.

Update error log after #2f2c533

  Updating 'ddu' (18.0.8.0 -> 18.0.8.1)
  Downloading new version
  Starting download with aria2 ...
  Download: Download Results:
  Download: gid   |stat|avg speed  |path/URI
  Download: ======+====+===========+=======================================================
  Download: b29a1f|OK  |   320KiB/s|%USERPROFILE%/scoop/cache/ddu#18.0.8.1#24ddba7.zip
  Download: Status Legend:
  Download: (OK):download completed.
  Checking hash of %5BGuru3D.com%5D-DDU.zip ... ok.
  Uninstalling 'ddu' (18.0.8.0)
  Unlinking ~\scoop\apps\ddu\current
  Installing 'ddu' (18.0.8.1) [64bit] from 'extras' bucket
  Loading %5BGuru3D.com%5D-DDU.zip from cache.
  Extracting %5BGuru3D.com%5D-DDU.zip ... done.
  Running pre_install script...ERROR Exit code was 2!
  Failed to extract files from %USERPROFILE%\scoop\apps\ddu\18.0.8.1/DDU v18.0.8.1.exe.
  Log file:
    ~\scoop\apps\ddu\18.0.8.1\7zip.log

  Please try again or create a new issue by using the following link and paste your console output:
  https://github.com/ScoopInstaller/Extras/issues/new?title=ddu%4018.0.8.1%3a+decompress+error

[github-actions]

All changes look good.

Wait for review from human collaborators.

ddu

• Description
• License
• Hashes
• Checkver
• Autoupdate