chore: do not use pinned elixir-ls versions

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

scripts/docker-entrypoint.sh

@@ -1,14 +1,6 @@
 #!/bin/bash
 set -e
 
-# NOTE: (jpd) setup elixir-ls for older versions of elixir
-if [ ! -d ${LOCAL_SRC_HOME}/elixir-ls/release ]; then
-	echo "setup elixir ls version 0.12.0"
-	/usr/local/bin/elixir-ls-setup v0.12.0
-	echo "setup elixir ls version 0.14.6"
-	/usr/local/bin/elixir-ls-setup v0.14.6
-fi
-
 # NOTE: (jpd) create auto-completion
 commands=(
 	"ctlptl"