release pythx 1.7.2 to bump requets to 0.25.1

* pythx version: 1.7.1
* Python version: 3.9
* Operating System: Ubuntu

### Description

I am trying to install pythx, but getting an error about requests being pinned to 2.25.0. When I look at your requirements.txt in the repo, you've already bumped it to 2.25.1

If you download the pythx-1.7.1.tar.gz from pypi, you can check the requirements.txt and see:

```
python-dateutil==2.8.1
inflection==0.5.1
PyJWT==1.7.1
requests==2.25.0
mythx-models==2.0.1
```

Start by comparing the repository's requirements.txt with the requirements.txt inside the pythx-1.7.1.tar.gz package on PyPI. Done means a 1.7.2 release is published whose bundled requirements pin requests to 2.25.1 instead of 2.25.0.

Written by the indexing model from the issue text.