[docker] use SIP maintenance version 4.19.9

in order to get proper signal Docstring for PyQGIS doc

.docker/qgis3-build-deps.dockerfile

@@ -66,8 +66,6 @@ RUN  apt-get update \
     python3-pyqt5.qsci \
     python3-pyqt5.qtsql \
     python3-pyqt5.qtsvg \
-    python3-sip \
-    python3-sip-dev \
     python3-termcolor \
     python3-yaml \
     qt3d5-dev \
@@ -99,6 +97,12 @@ RUN  apt-get update \
   && apt-get autoremove -y python3-pip python2.7 \
   && apt-get clean
 
+WORKDIR /root
+RUN wget --no-verbose https://www.riverbankcomputing.com/static/Downloads/sip/sip-4.19.9.dev1803171438.tar.gz \
+ && tar xzf sip-4.19.9.dev1803171438.tar.gz
+WORKDIR /root/sip-4.19.9.dev1803171438
+RUN python3 configure.py && make && make install
+
 RUN echo "alias python=python3" >> ~/.bash_aliases
 
 ENV CC=/usr/lib/ccache/clang