Minor fixes

[tclose]

• Include "testing" packages in list of "standard" packages for loading fileformats-extras
• Fixed up auto-versioning in GHA
• Made field.Array a sequence so it can be auto-coerced to list/np.array if required

[codecov[bot]]

Codecov Report

Patch coverage: 66.66% and project coverage change: +0.09% :tada:

Comparison is base (408afa0) 92.93% compared to head (c8356cb) 93.03%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #34 +/- ## ========================================== + Coverage 92.93% 93.03% +0.09% ========================================== Files 30 30 Lines 4304 4308 +4 Branches 431 431 ========================================== + Hits 4000 4008 +8 + Misses 236 232 -4 Partials 68 68 ``` | [Files Changed](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework) | Coverage Δ | | |---|---|---| | [fileformats/core/utils.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS91dGlscy5weQ==) | `77.24% <0.00%> (-1.38%)` | :arrow_down: | | [fileformats/field/\_\_init\_\_.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvZmllbGQvX19pbml0X18ucHk=) | `85.41% <80.00%> (-0.30%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/34/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework)

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