ci: bump cargo-deb version to 2.1.0

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

The ARM versions are going to be handled by updating the images (see ClementTsang/cargo-deb-arm#15).

Of note, technical breaking change as per the upstream cargo-deb repo:

Note Since v2.0.0 the deb package version will have a "-1" suffix. You can disable this by adding --deb-revision="" flag or revision = "" in Cargo metadata. The default suffix is for compliance with Debian's packaging standard.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

Mock nightly build: https://github.com/ClementTsang/bottom/actions/runs/8216472368

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)