sysutils/dua-cli: update to 2.20.1

2.20.1 (2023-05-05)
Bug Fixes
- release definition to use a more recent ubuntu, to get linux binaries.
  Otherwise there are no linux runners who can satisfy the request, and they
  hang forever, instead of saying something useful.

2.20.0 (2023-05-05)
New Features
- TUI now shows performance metrics while scanning and after. This is in
  preparation for the moonwalk upgrade.
- improve CLI help provided with the --format flag. It's now possible to see
  what possible values are without reading a swath of text. Now the default is
  shown as well which is more important now that it changes depending on the
  platform.
- use metric byte format only on MacOS. That way, on linux the binary format
  is used by default which is more common on that platform.

Bug Fixes
- Improve documentation for Marked Items pane to make clearer how to delete
  items.

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