Added support for pandas 2, dropped support for python 3.8

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b8cf576) 100.00% compared to head (866809e) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #50 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 16 16 Lines 784 106 -678 ========================================== - Hits 784 106 -678 ``` | [Impacted Files](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov) | Coverage Δ | | |---|---|---| | [src/pyextremes/models/distribution.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvbW9kZWxzL2Rpc3RyaWJ1dGlvbi5weQ==) | `100.00% <ø> (ø)` | | | [src/pyextremes/\_\_init\_\_.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | | [src/pyextremes/eva.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvZXZhLnB5) | `100.00% <100.00%> (ø)` | | | [src/pyextremes/extremes/block\_maxima.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvZXh0cmVtZXMvYmxvY2tfbWF4aW1hLnB5) | `100.00% <100.00%> (ø)` | | | [src/pyextremes/extremes/extremes.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvZXh0cmVtZXMvZXh0cmVtZXMucHk=) | `100.00% <100.00%> (ø)` | | | [src/pyextremes/extremes/peaks\_over\_threshold.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvZXh0cmVtZXMvcGVha3Nfb3Zlcl90aHJlc2hvbGQucHk=) | `100.00% <100.00%> (ø)` | | | [src/pyextremes/extremes/return\_periods.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvZXh0cmVtZXMvcmV0dXJuX3BlcmlvZHMucHk=) | `100.00% <100.00%> (ø)` | | | [src/pyextremes/models/models.py](https://codecov.io/gh/georgebv/pyextremes/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov#diff-c3JjL3B5ZXh0cmVtZXMvbW9kZWxzL21vZGVscy5weQ==) | `100.00% <100.00%> (ø)` | | ... and [6 files with indirect coverage changes](https://codecov.io/gh/georgebv/pyextremes/pull/50/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Bocharov) 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=George+Bocharov). 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=George+Bocharov)

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