Update gleam CI version

Author: giacomocavalieri

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: erlef/setup-beam@v1
         with:
           otp-version: "25.2"
-          gleam-version: "1.0.0"
+          gleam-version: "1.2.0"
           rebar3-version: "3"
           # elixir-version: "1.14.2"
       - run: gleam format --check src test