Not correct python version in Nixpack when using dockerfile (used to work)

# Pull the official base image
FROM python:3.10-slim-buster

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# The port environment variable is set by Railway when the container is run
# But we can default it to 8080 for local development
ENV PORT=8080

# Expose the port
EXPOSE $PORT

# Set work directory in the container
WORKDIR /code

# Install dependencies
# Copying the requirements file and installing dependencies separately 
# from copying the entire project ensures that Docker's cache is used more effectively,
# and dependencies are not unnecessarily reinstalled upon every build.
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt
    
# Copy project
COPY . /code/

# Command to run on container start ter
#CMD ["python", "main.py"]

# Command to run on container start
CMD uvicorn main:app --host 0.0.0.0 --port $PORT'

# Pull the official base image
FROM python:3.10-slim-buster

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# The port environment variable is set by Railway when the container is run
# But we can default it to 8080 for local development
ENV PORT=8080

# Expose the port
EXPOSE $PORT

# Set work directory in the container
WORKDIR /code

# Install dependencies
# Copying the requirements file and installing dependencies separately 
# from copying the entire project ensures that Docker's cache is used more effectively,
# and dependencies are not unnecessarily reinstalled upon every build.
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt
    
# Copy project
COPY . /code/

# Command to run on container start ter
#CMD ["python", "main.py"]

# Command to run on container start
CMD uvicorn main:app --host 0.0.0.0 --port $PORT'

13.35 ERROR: Could not find a version that satisfies the requirement pandas==2.1.4 (from versions: 0.1,  

13.35 ERROR: Could not find a version that satisfies the requirement pandas==2.1.4 (from versions: 0.1,