Fix warnings in pytest

[danielhollas]

Added some ignores for deprecation warnings.

I have decided to remove the settings that turned warnings into hard errors, since it turned out to be too much of a hassle.

[codecov[bot]]

Codecov Report

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

Project coverage is 83.61%. Comparing base (ae11a2b) to head (37189bd). Report is 11 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #628 +/- ## ======================================= Coverage 83.61% 83.61% ======================================= Files 16 16 Lines 3522 3522 ======================================= Hits 2945 2945 Misses 577 577 ``` | [Flag](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/628/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | Coverage Δ | | |---|---|---| | [python-3.11](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/628/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `83.61% <ø> (ø)` | | | [python-3.9](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/628/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `83.65% <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=aiidalab#carryforward-flags-in-the-pull-request-comment) to find out more.

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[danielhollas]

@edan-bainglass this should fix the test failures on your PRs.

[unkcpz]

Sorry for the late review, looks all good. If it supress warnings as expected, you can go ahead to merge without approve next time as well.