Add missing hatchling dependency to unstable CI

[djhoese]

Unstable is failing because hatchling isn't being installed. This should fix that.

• [ ] Closes #xxxx
• [ ] Tests added
• [ ] Fully documented
• [ ] Add your name to AUTHORS.md if not there already

[codecov[bot]]

Codecov Report

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

Project coverage is 95.94%. Comparing base (ab55c4a) to head (3c7938c). Report is 99 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2813 +/- ## ========================================== + Coverage 95.91% 95.94% +0.02% ========================================== Files 366 366 Lines 53504 53504 ========================================== + Hits 51321 51332 +11 + Misses 2183 2172 -11 ``` | [Flag](https://app.codecov.io/gh/pytroll/satpy/pull/2813/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pytroll) | Coverage Δ | | |---|---|---| | [behaviourtests](https://app.codecov.io/gh/pytroll/satpy/pull/2813/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pytroll) | `4.04% <ø> (+<0.01%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/pytroll/satpy/pull/2813/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pytroll) | `96.03% <ø> (+0.02%)` | :arrow_up: | 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=pytroll#carryforward-flags-in-the-pull-request-comment) to find out more.

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[coveralls]

Pull Request Test Coverage Report for Build 9485875755

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.04%

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Totals
Change from base Build 9418285216:	0.0%
Covered Lines:	51561
Relevant Lines:	53687

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💛 - Coveralls

[djhoese]

@mraspaud @pnuu this is ready for review. The unstable environment now has "proper" failing tests. There are failures for numba which doesn't support numpy 2 yet, but also some unexpected failures and warnings. Mainly some h5netcdf close context manager failures or something and a lot of unexpected output dtypes in the DayNightCompositor tests. The numpy 2 dtype PR in xarray has been merged so I expected these to go away. We should look into these failures and make sure that it isn't a missed use case or something we should/can fix in Satpy. That said, I think this PR should be merged as-is so that other PRs can implement the fixes.

[djhoese]

Haha, my open tab didn't refresh to show me that this was already merged many hours ago. Nevermind the review, thanks for merging!