chore: revert logback changes

Author: Christopher-Chianelli

src/main/resources/logback.xml

@@ -8,7 +8,7 @@
     </encoder>
   </appender>
 
-  <logger name="ai.timefold.solver" level="${logback.level.ai.timefold.solver:-info}"/>
+  <logger name="ai.timefold.solver" level="${logback.level.ai.timefold.solver:-warn}"/>
   <logger name="ai.timefold.solver.benchmarks" level="${logback.level.ai.timefold.solver:-info}"/>
   <logger name="ai.timefold.solver.benchmarks.examples" level="${logback.level.ai.timefold.solver:-warn}"/>