Use non-rc Elixir 1.18 in CI

Author: filmor

.github/workflows/main.yml

@@ -85,9 +85,9 @@ jobs:
     strategy:
       matrix:
         pair:
-          - { erlang: "27", elixir: "1.18.0-rc.0" }
-          - { erlang: "26", elixir: "1.18.0-rc.0" }
-          - { erlang: "27", elixir: "1.17", latest: true }
+          - { erlang: "27", elixir: "1.18", latest: true }
+          - { erlang: "26", elixir: "1.18" }
+          - { erlang: "27", elixir: "1.17" }
           - { erlang: "26", elixir: "1.17" }
           - { erlang: "26", elixir: "1.16" }
           - { erlang: "26", elixir: "1.15" }