[qpid-proton] Replace Python 3.9 Workaround With Base Builder Python …

…3.10

Replaces the ad-hoc workaround to install Python 3.9, with the
upgraded Python 3.10 version provided by the base-builder and
image.

projects/qpid-proton/Dockerfile

@@ -19,11 +19,6 @@ RUN apt-get update && \
     apt-get install -y \
         cmake
 
-# Ensure we work from right python version
-RUN apt-get install -y python3.9 python3.9-dev && \
-    ln --force -s /usr/bin/python3.9 /usr/local/bin/python3 && \
-    apt-get install -y python3-pip
-
 RUN git clone https://github.com/apache/qpid-proton.git
 
 WORKDIR qpid-proton