update Gleam version in CI

Author: giacomocavalieri

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: erlef/[email protected]
         with:
           otp-version: "26.0.2"
-          gleam-version: "0.33"
+          gleam-version: "0.34.1"
           rebar3-version: "3"
       - run: gleam format --check src test
       - run: gleam deps download