v1.30.1 - Patched Crest Feather

Retry premium backup upload. Help slow/unstable connections.

While working on 1.29.1 and the new encrypted DB backup upload
mechanism we noticed that for some unstable connections and big DB
backup sizes a timeout can happen and the DB upload fails.

After a lot of debugging it was noticed that a read timeout of a
socket happens here:
https://github.com/urllib3/urllib3/blob/f96a1cfc568beddf1e17ce7609609eca40780be5/src/urllib3/connectionpool.py#L785

A bit further down the HTTP request has a retry check:
https://github.com/urllib3/urllib3/blob/f96a1cfc568beddf1e17ce7609609eca40780be5/src/urllib3/connectionpool.py#L865

This is what this commit takes advantage of. Sets the requests session
for rotki.com in a way that we have at least 3 retries for all failed
requests.

The way the arguments are setup is also required as the retry
increment function checks against each different error type and
method:
https://github.com/urllib3/urllib3/blob/f96a1cfc568beddf1e17ce7609609eca40780be5/src/urllib3/util/retry.py#L540

Fix typo in attribute name