ci: Fix building trezor-firmware in Docker

[jirijakes]

• installs poetry from Debian package instead of pip
• removes dependency on pyblake2 from trezor-firwmare (it's not used anywhere)
• updates to wrapt 1.14.1 since the default 1.13.3 does not build on Python 3.11
• upgrades trezor-firwmare to 2.6.4

Tests pass on my machine with this setup.

Some of the changes should go to upstream (not yet sure if I try to). Weird is that nobody is complaining about it there, even though on my machine I encountered the same failures as in the Docker build.

If stars are aligned, should fix #93.

[danielabrozzoni]

Awesome, thanks!

ACK 7c957d1