Update Dockerfile

Dockerfile

@@ -1,5 +1,5 @@
-# Use an official Python runtime as a parent image
-FROM python:3.8-slim
+# Use an official Python runtime as a parent image (updated to Python 3.9-slim)
+FROM python:3.9-slim
 
 # Set the working directory in the container
 WORKDIR /app
@@ -7,6 +7,9 @@ WORKDIR /app
 # Copy the requirements file into the container
 COPY requirements.txt .
 
+# Upgrade pip to the latest version
+RUN pip install --upgrade pip
+
 # Install any needed packages specified in requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt