add OTP 25 to test matrix

Author: lukaszsamson

.github/workflows/ci.yml

@@ -33,6 +33,11 @@ jobs:
             tests_may_fail: false
             check_unused_deps: true
             warnings_as_errors: false
+          - elixir: 1.13.x
+            otp: 25.x
+            tests_may_fail: false
+            check_unused_deps: true
+            warnings_as_errors: false
           - elixir: 1.13.x
             otp: 24.3.x
             tests_may_fail: false