DEPS: drop np 1.20
The errors seem not related. #45651 1. Could you add this to the table of updated versions in the whatsnew note for 2.1?
2. Could you change this version in `pyproject.toml` and the sdist GHA workflow?
3. It looks like there's a `try/except` in `pandas/tests/extension/base/dtype.py::BaseDtypeTests:test_check_dtype` that can be removed now based on a comment regarding numpy 1.20 ```
=================================== FAILURES ===================================
_______________ TestBaseDtype.test_check_dtype[decimal128(7, 3)] _______________
[gw0] linux -- Python 3.8.0 /home/runner/micromamba/envs/test/bin/python3.8
[XPASS(strict)] decimal string repr affects numpy comparison
``` Thanks @fangchenli 