freeze dockerfile pip dependencies

Author: Tony Crisci

Dockerfile

@@ -26,15 +26,15 @@ RUN export DEBIAN_FRONTEND=noninteractive; \
     dbus \
     python3-gi
 
-RUN pip3 install yapf flake8 && \
+RUN pip3 install 'yapf==0.31' 'flake8==4.0.1' && \
     curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && \
     for py in python3 python3.6 python3.7 python3.9 python3.10; do \
         ${py} get-pip.py; \
         PYTHONPATH=/usr/lib/${py}/site-packages ${py} -m pip install \
-            pytest \
-            pytest-asyncio \
-            pytest-timeout \
-            pytest-cov; \
+            'pytest==6.2.5' \
+            'pytest-asyncio==0.16.0' \
+            'pytest-timeout==2.0.2' \
+            'pytest-cov==3.0.0'; \
     done
 
 ADD . /app