fix(deps): update dependency org.cactoos:cactoos to v0.56.0

pom.xml

@@ -72,7 +72,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
     <dependency>
       <groupId>org.cactoos</groupId>
       <artifactId>cactoos</artifactId>
-      <version>0.55.0</version>
+      <version>0.56.0</version>
     </dependency>
     <dependency>
       <groupId>com.jcabi</groupId>