Add elixir 1.19 to CI matrix

Author: san650

.github/workflows/ci.yml

@@ -25,7 +25,8 @@ jobs:
           - { elixir: 1.16, otp: 24 }
           - { elixir: 1.16, otp: 25 }
           - { elixir: 1.16, otp: 26 }
-          - { elixir: "1.18", otp: "27" }
+          - { elixir: 1.18, otp: 27 }
+          - { elixir: 1.19, otp: 27 }
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}