docs: Add protobuf dependencies to linux setup instructions (XRPLF#5156)

Author: vlntb

docs/build/environment.md

@@ -23,7 +23,7 @@ direction.
 
 ```
 apt update
-apt install --yes curl git libssl-dev python3.10-dev python3-pip make g++-11
+apt install --yes curl git libssl-dev python3.10-dev python3-pip make g++-11 libprotobuf-dev protobuf-compiler
 
 curl --location --remote-name \
   "https://github.com/Kitware/CMake/releases/download/v3.25.1/cmake-3.25.1.tar.gz"