project: update course certification app references

courses/classes/serializers.py

@@ -5,7 +5,7 @@ from baquara.users.serializers import SimpleUserSerializer, TimtecUserAdminCerti
 from courses.models import CourseStudent
 from courses.serializers import BasicCourseSerializer
 from courses.workspaces.serializers import WorkspaceBaseSerializerMixin
-from courses_certification.serializers import (
+from courses.certification.serializers import (
     CourseCertificationSerializer,
     CertificationProcessSerializer,
     EvaluationSerializer,

courses/classes/signals.py

 from django.db.models.signals import post_save
 
 from courses.models import CourseStudent
-from courses_certification.models import CourseCertification
+from courses.certification.models import CourseCertification
 
 
 @receiver(m2m_changed, sender=Class.students.through)