Fixed CI

Author: ankane

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
         include:
           - elixir: 1.18
             otp: 27
-          - elixir: 1.13
+          - elixir: 1.15
             otp: 24
     steps:
       - uses: actions/checkout@v4