chore: do not use pinned elixir-ls versions

There is no need to pin `elixir-ls` version for older versions of
elixir.

Dockerfile

@@ -153,9 +153,6 @@ ENV XDG_CACHE_HOME ${HOME}/.cache
 ENV STARSHIP_CONFIG ${XDG_CONFIG_HOME}/starship/config.toml
 ENV PATH ${LOCAL_BIN_HOME}:$PATH
 
-# fetch elixir-ls to install custom releases
-RUN git clone https://github.com/elixir-lsp/elixir-ls.git ${LOCAL_SRC_HOME}/elixir-ls
-
 # command line utilities
 ENV MISE_ENV_FILE .env
 RUN curl https://mise.jdx.dev/install.sh | sh \