fix: change const to let for age variable to allow reassignment

Author: Grajales-K

Sprint-1/errors/1.js

@@ -1,4 +1,7 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age = age + 1;
+let age = 33;
+age += 1;
+console.log(age);
+
+// We need to use 'let' to reassign a variable; 'const' does not allow reassignment.