Update dependency org.cactoos:cactoos to v0.56.0

Author: renovate[bot]

pom.xml

@@ -105,7 +105,7 @@ SOFTWARE.
     <dependency>
       <groupId>org.cactoos</groupId>
       <artifactId>cactoos</artifactId>
-      <version>0.55.0</version>
+      <version>0.56.0</version>
     </dependency>
   </dependencies>
   <build>