Correct CI version

Author: lpil

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: erlef/setup-beam@v1
         with:
           otp-version: "26.0.2"
-          gleam-version: "1.2.0"
+          gleam-version: "1.2.0-rc1"
       - uses: actions/setup-node@v3
         with:
           node-version: "16.18.1"