other: rounding gpa to 2 decimal places

Author: flben233

src/main/java/org/shirakawatyu/handixikebackend/api/impl/MatrixScoreApi.java

@@ -79,6 +79,9 @@ private GradePointAverage calculateGPA(ArrayList<Score> scores) {
         }
         gpa = gpa / totalCredits;
         requiredGpa = requiredGpa / requiredCredits;
+
+        gpa = Math.round(gpa * 100.0) / 100.0;
+        requiredGpa = Math.round(requiredGpa * 100.0) / 100.0;
         return new GradePointAverage(gpa, requiredGpa);
     }
 }