Elixir 1.18 support

[scohen]

Lexical should support 1.18.

[akagr]

I ran mix package after making the following change and so far it's been chugging along nicely.

diff --git a/apps/server/lib/lexical/server/boot.ex b/apps/server/lib/lexical/server/boot.ex
index 2a5df77..0cc7f0c 100644
--- a/apps/server/lib/lexical/server/boot.ex
+++ b/apps/server/lib/lexical/server/boot.ex
@@ -88,7 +88,8 @@ defmodule Lexical.Server.Boot do
     "1.15.0" => ">= 1.15.3",
     "1.16.0" => ">= 1.16.0",
     "1.17.0-rc" => ">= 1.17.0-rc",
-    "1.17.0" => ">= 1.17.0"
+    "1.17.0" => ">= 1.17.0",
+    "1.18.0" => ">= 1.18.0"
   }
   @allowed_erlang %{
     "24" => ">= 24.3.4",