Fix seed of two tests in `quantum_info`

[renatomello]

Closes #1405 and #1392

Checklist:

• [x] Reviewers confirm new code works as expected.
• [x] Tests are passing.
• [x] Coverage does not decrease.
• [x] Documentation is updated.

[codecov[bot]]

Codecov Report

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

Project coverage is 99.94%. Comparing base (9db9b66) to head (7b085fe).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1407 +/- ## ========================================== - Coverage 99.99% 99.94% -0.05% ========================================== Files 78 78 Lines 11222 11222 ========================================== - Hits 11221 11216 -5 - Misses 1 6 +5 ``` | [Flag](https://app.codecov.io/gh/qiboteam/qibo/pull/1407/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/qibo/pull/1407/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | `99.94% <ø> (-0.05%)` | :arrow_down: | 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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[csookim]

Thank you for your update. I have removed the review request because I think I'm not the most suitable person to review this.