readme/docker: Fix "Dependencies" link

Author: VelocityRa

README_docker.md

@@ -9,7 +9,7 @@ docker run -it my_project:latest
 ```
 
 This command will put you in a `bash` session in a Ubuntu 20.04 Docker container,
-with all of the tools listed in the [Dependencies](#dependencies) section already installed.
+with all of the tools listed in the [Dependencies](README_dependencies.md#dependencies) section already installed.
 Additionally, you will have `g++-11` and `clang++-13` installed as the default
 versions of `g++` and `clang++`.