fix: PATCH endpoint project estimate validation (#7872)

Author: SamuelTR20

apps/api/plane/api/serializers/project.py

@@ -17,7 +17,7 @@
 from .base import BaseSerializer
 
 
-class ProjectCreateSerializer(BaseSerializer):
+class  ProjectCreateSerializer(BaseSerializer):
     """
     Serializer for creating projects with workspace validation.
 
@@ -171,7 +171,7 @@ def update(self, instance, validated_data):
 
         if (
             validated_data.get("estimate", None) is not None
-            and not Estimate.objects.filter(project=instance, id=validated_data.get("estimate")).exists()
+            and not Estimate.objects.filter(project=instance, id=validated_data.get("estimate").id).exists()
         ):
             # Check if the estimate is a estimate in the project
             raise serializers.ValidationError("Estimate should be a estimate in the project")