Bugfix to matrix unpacking for `CliffordBackend`

[BrunoLiegiBastonLiegi]

This has to be merged after qiboteam/qibo#1457. GPU tests are passing.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.91%. Comparing base (d1f81fb) to head (9cd5d44). Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #190 +/- ## ======================================= Coverage 99.91% 99.91% ======================================= Files 12 12 Lines 1115 1115 ======================================= Hits 1114 1114 Misses 1 1 ``` | [Flag](https://app.codecov.io/gh/qiboteam/qibojit/pull/190/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/qiboteam/qibojit/pull/190/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | `99.91% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam#carryforward-flags-in-the-pull-request-comment) to find out more.

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[BrunoLiegiBastonLiegi]

This is failing because it needs qiboteam/qibo#1454. We should merge that one first. Regarding the qibo dependency, this is now pointing at qibo main, we will change it to qibo = "^0.2.12" after the release.