chore: upgrade elixir/erlang versions (#4)

Upgrade runtimes to latest versions:

* elixir from 1.15.4 to 1.15.6
* erlang from 26.0.2 to 26.1.1

Co-authored-by: Joao P Dubas <joao.dubas@gmail.com>
Reviewed-on: #4

config/nvim/lua/custom/plugins/init.lua

@@ -85,7 +85,9 @@ return {
             python = require('iron.fts.python').ipython,
             typescript = require('iron.fts.typescript').ts
           }
-        }
+        },
+        highlight = { italic = true },
+        ignore_blank_lines = true
       })
     end
   },

config/rtx/config.toml

@@ -1,7 +1,7 @@
 [tools]
 awscli = "2.13.5"
-elixir = "1.15.4-otp-26"
-erlang = "26.0.2"
+elixir = "1.15.6-otp-26"
+erlang = "26.1.1"
 go = "1.20.6"
 helm = "3.12.2"
 kubectl = "1.27.4"