Fix apt install call

postgres/dockerfile

@@ -2,7 +2,7 @@ FROM postgres:latest
 
 ENV PATH="${PATH}:/opt"
 
-RUN apt update -y && apt install \
+RUN apt update -y && apt upgrade -y && apt install -y \
     postgresql-client
 
 # not necessary, but for sake of clarity

rdmo/dockerfile_master

@@ -4,7 +4,7 @@ ARG UID=<UID>
 
 ENV PATH=/opt:${PATH}
 
-RUN apt update -y && apt install -y \
+RUN apt update -y && apt upgrade -y && apt install -y \
     python3 \
     python3-dev \
     python3-pip \