docker compose:

version: '3.9'
services:
   django:
      build: ./forum/
      ports:
         - "8000:8000"
      restart: always
      networks:
         project_network:
   telegram:
      build: ./tgbot/
      ports:
          - "8080:8080"
      restart: always
      networks:
         project_network:
networks:
  project_network:
    external: true

aiogram request:

response = requests.get('http://django:8000').text
 await message.answer(response)

Django dockerfile

FROM python:3.10

WORKDIR /django

COPY . .

RUN pip install -r requirements.txt

CMD ["python", "manage.py", "runserver", "8000"]

change http://django:8000 to http://localhost:8000|

change outer and inner ports