add patch endpoint and service update_task

src/services/tasks.py

@@ -1,7 +1,7 @@
 from fastapi import HTTPException
 
 from src.models.tasks import TasksORM
-from src.schemas.tasks import Task, TaskADDRequest
+from src.schemas.tasks import Task, TaskADDRequest, TaskPATCHRequest
 from src.services.base import BaseService
 
 
@@ -27,3 +27,8 @@ class TaskService(BaseService):
     async def delete_task(self, task_id: int):
         await self.session.task.delete_one(id=task_id)
         await self.session.commit()
+
+    async def update_task(self, task_id: int, task_data: TaskPATCHRequest, exclude_unset: bool = True):
+        task = await self.session.task.update_one(id=task_id, data=task_data.model_dump(exclude_unset=exclude_unset))
+        await self.session.commit()
+        return Task.model_validate(task)