Pin pylint on 2024.1

new pylint release introduces new checkers.
the policy in Octavia is to pin linters on stable branches.

Change-Id: Ie069ca415e8ff8eab2c9bb3db439a950751d8854

Author: gthiemonge

test-requirements.txt

@@ -8,7 +8,7 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 flake8-import-order>=0.18.0,<0.19.0 # LGPLv3
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslotest>=3.2.0 # Apache-2.0
-pylint>=2.5.3 # GPLv2
+pylint>=2.5.3,<3.2.0 # GPLv2
 testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 testresources>=2.0.0 # Apache-2.0/BSD