Support Elixir 1.18 in GitHub CI (#117)

Author: kianmeng

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
         include:
           - elixir: "1.10"
             otp: "22"
-          - elixir: "1.17"
+          - elixir: "1.18"
             otp: "27"
             lint: lint