Use 24.3, not 24.2

Author: ollien

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         include:
           - elixir-version: 1.12.3
-            otp-version: 24.2
+            otp-version: 24.3
           - elixir-version: 1.15.5
             otp-version: 25.3
     steps: