fix: add pytest-qt deps to dockerfile (pandas-dev#56731)

Author: edydfang

Dockerfile

@@ -5,7 +5,8 @@ RUN apt-get update && apt-get -y upgrade
 RUN apt-get install -y build-essential
 
 # hdf5 needed for pytables installation
-RUN apt-get install -y libhdf5-dev
+# libgles2-mesa needed for pytest-qt
+RUN apt-get install -y libhdf5-dev libgles2-mesa-dev
 
 RUN python -m pip install --upgrade pip
 RUN python -m pip install \