opening a Veracrypt volume fails if the passphrase is too long

Originally created by @goupille on #17474 (Redmine)

A user reported that if a veracrypt volume is encrypted with a passphrase longer than 64 characters, it is not possible to open it in Tails. Given it is possible to create such volumes outside of Tails, If it is not fixable, the documentation should at least mention that problem.

To-Do

Test that it's indeed fixed on Bullseye
- suggestion: locally patch our test suite to use a long passphrase
Remove the doc about this problem

Edited Dec 10, 2021 by intrigeri

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