client: Dockerfiles: resolve apt CLI warning

client/Dockerfiles/finance/Dockerfile.ubuntu.in

@@ -40,9 +40,9 @@ RUN chown root:wheel /usr/local/* && chmod g+rwx /usr/local/*
 # Package dependencies
 #
 
-RUN apt update -y
+RUN apt-get update -y
 
-RUN apt install -y \
+RUN apt-get install -y \
   gawk \
   git \
   hledger \
@@ -53,7 +53,7 @@ RUN apt install -y \
   visidata \
   zlib1g-dev
 
-RUN apt install -y cargo
+RUN apt-get install -y cargo
 RUN cargo install xsv --root /usr
 
 USER @DOCKER_FINANCE_USER@
@@ -66,7 +66,7 @@ RUN pipx install csvkit
 #
 
 USER root
-RUN apt install -y \
+RUN apt-get install -y \
   bc \
   composer \
   php \