removed inactive GHAs

Author: RobertDober

.github/workflows/elixir.yml

@@ -14,12 +14,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - elixir: 1.12.x
-            otp: 23
-            os: ubuntu-20.04
-          - elixir: 1.13.x
-            otp: 24
-            os: ubuntu-20.04
           - elixir: 1.14.x
             otp: 25
             os: ubuntu-latest

mix.exs

@@ -34,7 +34,7 @@ defmodule Earmark.Mixfile do
       app: :earmark,
       version: @version,
       compilers: [:leex, :yecc] ++ Mix.compilers(),
-      elixir: "~> 1.12",
+      elixir: "~> 1.14",
       elixirc_paths: elixirc_paths(Mix.env()),
       escript: escript_config(),
       deps: @deps,