Drop support for Elixir v1.12 (#123)

Also, drop support for older RustlerPrecompiled.

.github/workflows/ci.yml

@@ -20,16 +20,16 @@ jobs:
       matrix:
         include:
           - pair:
-              elixir: 1.12.3
-              otp: 23.3.4
+              elixir: 1.13.4
+              otp: "24.3"
           - pair:
-              elixir: 1.14.5
-              otp: "26.0"
+              elixir: 1.15.7
+              otp: "26.1"
             lint: lint
     steps:
       - uses: actions/checkout@v3
 
-      - uses: erlef/setup-beam@v1.15
+      - uses: erlef/setup-beam@v1.16
         with:
           otp-version: ${{ matrix.pair.otp }}
           elixir-version: ${{ matrix.pair.elixir }}

mix.exs

@@ -8,7 +8,7 @@ defmodule Html5ever.Mixfile do
     [
       app: :html5ever,
       version: @version,
-      elixir: "~> 1.12",
+      elixir: "~> 1.13",
       build_embedded: Mix.env() == :prod,
       start_permanent: Mix.env() == :prod,
       deps: deps(),
@@ -24,7 +24,7 @@ defmodule Html5ever.Mixfile do
 
   defp deps do
     [
-      {:rustler_precompiled, "~> 0.5.2 or ~> 0.6.0 or ~> 0.7.0"},
+      {:rustler_precompiled, "~> 0.6.0 or ~> 0.7.0"},
       {:rustler, ">= 0.0.0", optional: true},
       {:ex_doc, ">= 0.0.0", only: :dev}
     ]