client: Dockerfiles: ubuntu: fix botan dependency

- The library is needed, not the utility binary
- Fixes `root` loading errors about missing headers

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

@@ -62,9 +62,9 @@ RUN echo "export PATH=\"\$PATH::/usr/local/src/root/bin\"" | tee -a ~/.bash_alia
 # docker-finance
 USER root
 RUN apt-get install -y \
-  botan \
   googletest \
   libbenchmark-dev \
+  libbotan-2-dev \
   libcrypto++-dev \
   libsodium-dev