@master branch timeout behind proxy

[collardmsc]

I'm getting a timeout when running the
Gamesight/slack-workflow-status@master action

Some other IPs that are erroring out:
52.192.46.121:443
52.196.128.139:443
35.73.126.78:443
35.74.58.174:443

The action WORKS when I change it from
Gamesight/slack-workflow-status**@master**
to
Gamesight/slack-workflow-status**@v1**

Also, when the action ran with "@master" on 12/1 it was still working. Sometime between 12/2 and 12/13 it started getting the timeout.

I should mention that the environment this action is running on is behind a proxy, but the proxy itself hasn't changed recently to the best of my knowledge.

For now I will just use @v1, but am interesting in knowing what changed/broke.

[rsyvarth]

Biggest change was replacing the request library with slack's webhook package. I am wondering if that isn't playing nice with your proxy for some reason.