Update Dockerfile

Dockerfile

@@ -10,11 +10,11 @@ RUN apt-get update && \
     rm -rf /var/lib/apt/lists/*
 
 # Set Python 3.9 as the default
-RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.9 1
+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 && \
-    python3.9 get-pip.py && \
+    python3 get-pip.py && \
     rm get-pip.py
 
 # Install Git