Update `pyproject.toml`, gh-actions and store version string only once

[codecov[bot]]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (6b50a7e) compared to base (8e2ed49). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #129 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 22 24 +2 Lines 794 978 +184 ========================================== + Hits 794 978 +184 ``` | [Impacted Files](https://codecov.io/gh/adtzlr/matadi/pull/129?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler) | Coverage Δ | | |---|---|---| | [matadi/\_\_about\_\_.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL19fYWJvdXRfXy5weQ==) | `100.00% <100.00%> (ø)` | | | [matadi/\_\_init\_\_.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [matadi/\_lab\_compressible.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL19sYWJfY29tcHJlc3NpYmxlLnB5) | `100.00% <100.00%> (ø)` | | | [matadi/\_lab\_incompressible.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL19sYWJfaW5jb21wcmVzc2libGUucHk=) | `100.00% <100.00%> (ø)` | | | [matadi/\_material.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL19tYXRlcmlhbC5weQ==) | `100.00% <100.00%> (ø)` | | | [matadi/\_templates.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL190ZW1wbGF0ZXMucHk=) | `100.00% <100.00%> (ø)` | | | [matadi/math.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL21hdGgucHk=) | `100.00% <100.00%> (ø)` | | | [matadi/models/\_\_init\_\_.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL21vZGVscy9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | | | [matadi/models/\_helpers.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL21vZGVscy9faGVscGVycy5weQ==) | `100.00% <100.00%> (ø)` | | | [matadi/models/\_hyperelasticity\_anisotropic.py](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler#diff-bWF0YWRpL21vZGVscy9faHlwZXJlbGFzdGljaXR5X2FuaXNvdHJvcGljLnB5) | `100.00% <100.00%> (ø)` | | | ... and [12 more](https://codecov.io/gh/adtzlr/matadi/pull/129/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Dutzler) | | 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=Andreas+Dutzler). 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=Andreas+Dutzler)

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