Update dependency io.rest-assured:rest-assured to v5

Author: renovate[bot]

backend/pom.xml

@@ -18,7 +18,7 @@
 		<java.version>1.8</java.version>
 
 		<!-- backend dependencies -->
-		<rest-assured.version>4.5.1</rest-assured.version>
+		<rest-assured.version>5.3.0</rest-assured.version>
 		<postgresql.version>42.5.1</postgresql.version>
 		<groovy.version>3.0.13</groovy.version>
 	</properties>