Add elixir 1.19 rc to CI

Author: PragTob

.github/workflows/main.yml

@@ -42,6 +42,8 @@ jobs:
             otp_version: '27.3'
             type_check: true
             lint: true
+          - elixir_version: '1.19.0-rc.2'
+            otp_version: '28.1'
 
     steps:
       - name: Checkout