docker: Upgrades base packages in the images.

Related to #14182

Dockerfile

@@ -50,7 +50,8 @@ ENV PATH=/usr/share/grafana/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bi
 
 WORKDIR $GF_PATHS_HOME
 
-RUN apt-get update && apt-get install -qq -y libfontconfig ca-certificates && \
+RUN apt-get update && apt-get upgrade -y && \
+    apt-get install -qq -y libfontconfig ca-certificates && \
     apt-get autoremove -y && \
     rm -rf /var/lib/apt/lists/*
 

packaging/docker/Dockerfile

@@ -25,7 +25,8 @@ ENV PATH=/usr/share/grafana/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bi
 
 WORKDIR $GF_PATHS_HOME
 
-RUN apt-get update && apt-get install -qq -y libfontconfig ca-certificates curl && \
+RUN apt-get update && apt-get -y upgrade && \
+    apt-get install -qq -y libfontconfig ca-certificates curl && \
     apt-get autoremove -y && \
     rm -rf /var/lib/apt/lists/*