Build for RHEL9 fails again

[tuxmaster5000]

The problem is that my patch was reverted by
#1087
But RHEL don't support SHA1 any more, so signature_method must be
SIGNATURE_RSA_SHA512

[tuxmaster5000]

Now the tests fails with:
atlassian/rest_client.py:10: in
from oauthlib.oauth1 import SIGNATURE_RSA
E ImportError: cannot import name 'SIGNATURE_RSA' from 'oauthlib.oauth1' (/usr/lib/python3.9/site-packages/oauthlib/oauth1/init.py)

[gonchik]

#1095 fixed looks like