Support pandas version 2

[victorlin]

In the process of nextstrain/public#12, it was noticed that pandas dependency version constraint in this repo is preventing Nextstrain runtimes from resolving to pandas version 2.

evofr/pyproject.toml

Line 11 in 2c91dd8

pandas = "^1.4.2"

It's possible that the code is already compatible with pandas v2, in which case the fix is as simple as changing that line to pandas = ">=1.4.2, <3". Some testing would be appropriate. Here are some resources for the migration:

• What’s new in 2.0.0 (April 3, 2023) — pandas 2.2.3 documentation
• Migrate code from pandas 1 to pandas 2 - Algorithmus Schmiede