Drop workaround for 1.10 --warnings-as-errors bug

Author: michalmuskala

.github/workflows/ci.yml

@@ -26,10 +26,9 @@ jobs:
             otp: 20.3.8.26
           - elixir: 1.9.x
             otp: 20.3.8.26
-            warnings_as_errors: true # 1.10 is not enough as its --warnigs-as-errors has bugs https://github.com/elixir-lang/elixir/issues/10073
           - elixir: 1.10.x
             otp: 21.3.8.18
-          - elixir: 1.10.x
+          - elixir: 1.11.x
             otp: 22.3.4.12
           - elixir: 1.11.x
             otp: 23.1.1