fix(stepDefinition): update DELETE user step definition regex for consistency

Author: Theo-lbg

src/test/java/feature/StepDefinition.java

@@ -86,7 +86,7 @@ public void theClientCallToDeleteTheCreatedUser() {
         executeDelete("/random-users/" + createdUserId);
     }
 
-    @When("the client call to DELETE /random-users/{int}")
+    @When("^the client call to DELETE /random-users/(\\d+)$")
     public void theClientCallToDeleteRandomUser(int id) {
         executeDelete("/random-users/" + id);
     }