nk3: Drop Version.__hash__

[robin-nitrokey]

Due to the issues discussed in #339 [0] and #340 [1], this patch removes the Version.__hash__ method and replaces the only usage of Version in a dict with a flattened list.

[0] https://github.com/Nitrokey/pynitrokey/pull/339 [1] https://github.com/Nitrokey/pynitrokey/pull/340

Fixes: https://github.com/Nitrokey/pynitrokey/issues/349

Checklist

• [x] tested with Python3.9
• [x] run make check or make fix for the formatting check
• [x] signed commits
• [ ] updated documentation (e.g. parameter description, inline doc, docs.nitrokey)
• [x] added labels