Relax package dependency requirements

[WeatherGod]

• Relax dependency requirements to allow newer versions.
• Gain numpy 2.x compatibility by fixing np.NaN to np.nan

[WeatherGod]

Closes #535. Trying it out without pinning numpy to <2.0 as, technically, it didn't before.

[WeatherGod]

Just did a numpy 2.0 compatibility check with ruff, and there are some mistakes that looks like are easily fixable.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[WeatherGod]

This also supersedes #536.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request focuses on relaxing package dependency requirements by replacing all instances of np.NaN with np.nan across multiple files. This change ensures consistency and compatibility with different versions of numpy.

File-Level Changes

Files	Changes
src/climate_indices/compute.py src/climate_indices/utils.py src/climate_indices/eto.py src/climate_indices/__spi__.py	Replaced all instances of np.NaN with np.nan for consistency and to avoid potential issues with different numpy versions.

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[sourcery-ai]

Hey @WeatherGod - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[monocongo]

Thanks for the tidy-up for numpy, @WeatherGod