Added some nullable regions to get rid of compiler warnings and follow best practices

ScrumTaskboard/Controllers/SprintsController.cs

@@ -16,9 +16,10 @@ namespace ScrumTaskboard.Controllers
         public SprintsController(TaskContext context)
         {
             _context = context;
-        }
-
-        // GET: api/sprint
+        }
+
+        // GET: api/sprint
+        #nullable enable
         [HttpGet]
         public async Task<ActionResult<IEnumerable<ScrumSprint>>> GetSprint([FromQuery]string? title, [FromQuery]int? projectid, [FromQuery]DateTime? startDate, [FromQuery]DateTime? endDate)
         {
@@ -43,6 +44,7 @@ namespace ScrumTaskboard.Controllers
 
             return await filtered.ToListAsync();
         }
+        #nullable disable
 
         // GET: api/sprint/5
         [HttpGet("{id}")]