fix(challenges): update consecutive-numbers

A little bit harder by having as input consecutive numbers needed to consider

challenges/consecutive-numbers/test/5/input.txt

@@ -1,8 +1,2 @@
-5
-1
-2
 3
-8
--5
--4
-7
+5 ; 1 ; 2 ; 3 ; 8 ; -5 ; -4 ; 7

challenges/consecutive-numbers/test/5/output.txt

@@ -1,3 +1 @@
-1 ; 2
-2 ; 3
--5 ; -4
+1 ; 2 ; 3