Update Dockerfile

Dockerfile

@@ -9,12 +9,9 @@ RUN apt-get update && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-# Set Python 3.9 as the default
-RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3
-
 # Install pip for Python 3.9
 RUN wget https://bootstrap.pypa.io/get-pip.py && \
-    python3 get-pip.py && \
+    python get-pip.py && \
     rm get-pip.py
 
 # Install Git