Revert "build: upgraded to 3.5.0"

This reverts commit 7371940

Author: cuprumtan

github-actions-tests/sources/agent_3.5.0.conf

@@ -1,7 +1,7 @@
 __author__ = 'Dmitry Vasilyev'
 __author_email__ = '[email protected]'
 __description__ = 'Monitoring agent for PostgreSQL'
-__version__ = '3.5.0'
+__version__ = '3.4.0'
 __licence__ = 'BSD'
 
 __url__ = 'https://github.com/postgrespro/mamonsu'