BUILD: conda unable to solve for a dev env using environment.yml in finite time
### 

- [X] I have read the [installation guide](https://pandas.pydata.org/pandas-docs/stable/getting_started/install.html#installing-pandas).


### Platform

win-64

### Installation Method

conda install

### pandas Version

latest master

### Python Version

n/a

### Installation Logs

<details>

$ conda env create -f environment.yml
Collecting package metadata (repodata.json): done
Solving environment: /

</details>

* Full disclosure: this is not a `pandas` issue per se, this is a `conda` issue. However, I see two ways to solve this issue for anyone trying to build `pandas` locally:

1. Use `mamba` instead of `conda` to create dev environment. `mamba` has a much faster SAT solver compared to `conda`.
2. (Probably, preferred) Pin package version numbers _for each platform_ in https://github.com/pandas-dev/pandas/blob/c03cc2245538e3a2c182f6eb15cfb143897a9503/environment.yml.
