fix CI

Author: giacomocavalieri

.github/workflows/test.yml

@@ -14,8 +14,8 @@ jobs:
       - uses: actions/checkout@v3.5.3
       - uses: erlef/setup-beam@v1.18.0
         with:
-          otp-version: "27"
-          gleam-version: "1.8.0"
+          otp-version: "28"
+          gleam-version: "1.12.0-rc2"
           rebar3-version: "3"
       - run: gleam format --check src test
       - run: gleam deps download