chore: restrict websockets library version

Restricts the websockets library version to only install releases before
14.0. This is needed since websockets 14 introduces a number of breaking
changes that are not compatible with python-libjuju.

Author: luissimas

setup.py

@@ -26,7 +26,7 @@
         'macaroonbakery>=1.1,<2.0',
         'pyRFC3339>=1.0,<2.0',
         'pyyaml>=5.1.2',
-        'websockets>=8.1',
+        'websockets>=8.1,<14.0',
         'paramiko>=2.4.0',
         'pyasn1>=0.4.4',
         'toposort>=1.5,<2',