client: Dockerfiles: resolve apt CLI warning

client/Dockerfiles/finance/ubuntu/Dockerfile.root.in

@@ -22,7 +22,7 @@
 USER root
 
 # ROOT.cern dependencies (regardless of building or not)
-RUN apt install -y \
+RUN apt-get install -y \
   binutils \
   cmake \
   dpkg-dev \
@@ -37,7 +37,7 @@ RUN apt install -y \
   python3
 
 # ROOT.cern pre-compiled installation
-RUN apt install -y curl
+RUN apt-get install -y curl
 USER builder
 WORKDIR /usr/local/src
 RUN curl --location -O "https://root.cern/download/root_v6.32.02.Linux-ubuntu24.04-x86_64-gcc13.2.tar.gz"
@@ -61,7 +61,7 @@ RUN echo "export PATH=\"\$PATH::/usr/local/src/root/bin\"" | tee -a ~/.bash_alia
 
 # docker-finance
 USER root
-RUN apt install -y \
+RUN apt-get install -y \
   botan \
   googletest \
   libbenchmark-dev \