[Bug] error/warning with 'date_parser' argument of `pandas.read_csv()` and Pandas version 2.0.0

[Hirokazu Takaya]

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• I agree to create a new issue with the other templates if this is not a bug.
• I used the latest version of covsirphy.

Summary

Pandas version 2.0.0 removed date_parser and added date_format instead. We should use Pandas version >= 2.0.0 and date_format argument. Refer to error on https://github.com/lisphilar/covid19-sir/actions/runs/4707362321/jobs/8349176036 and https://pandas.pydata.org/docs/reference/api/pandas.read_csv.html

Reproducible example script

NA

The current outputs

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Expected outputs

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Environment

- CovsirPhy version: 3.0.0.dev12
- Python version: 3.11.1

Package manager (required if installation issue)

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Platform (required if installation issue)

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Additional Context

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