Update deprecated GitHub actions

[giffels]

This pull request addresses potential warnings about the migration of GitHub actions from nodejs:12 to nodejs:16.

Like

Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: actions/checkout@v2,
actions/setup-python@v2, codecov/codecov-action@v1. 
For more information see: 
https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

Fixes issue with missing Python 3.6 on ubuntu:latest (see https://github.com/actions/runner-images/issues/6399).

[codecov[bot]]

Codecov Report

Base: 92.91% // Head: 92.73% // Decreases project coverage by -0.18% :warning:

Coverage data is based on head (c1003e2) compared to base (0343272). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #118 +/- ## ========================================== - Coverage 92.91% 92.73% -0.18% ========================================== Files 34 34 Lines 1143 1143 Branches 166 166 ========================================== - Hits 1062 1060 -2 - Misses 59 60 +1 - Partials 22 23 +1 ``` | [Impacted Files](https://codecov.io/gh/MatterMiners/cobald/pull/118?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MatterMiners) | Coverage Δ | | |---|---|---| | [src/cobald/daemon/runners/trio\_runner.py](https://codecov.io/gh/MatterMiners/cobald/pull/118?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MatterMiners#diff-c3JjL2NvYmFsZC9kYWVtb24vcnVubmVycy90cmlvX3J1bm5lci5weQ==) | `94.64% <0.00%> (-3.58%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MatterMiners). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MatterMiners)

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[maxfischer2781]

Do you need to make any more changes to this? I'm fine with merging this otherwise.

[giffels]

No. Please, merge.