Allow beta

Signed-off-by: Sora Morimoto <sora@morimoto.io>

Author: smorimoto

.github/workflows/workflow.yml

@@ -45,11 +45,11 @@ jobs:
         ocaml-compiler:
           - "5.3"
         allow-prerelease-opam:
-          - false
+          - true
         include:
           - os: ubuntu-latest
             ocaml-compiler: ocaml-variants.5.3.0+options,ocaml-option-flambda
-            allow-prerelease-opam: false
+            allow-prerelease-opam: true
           - os: ubuntu-latest
             ocaml-compiler: "5.3"
             allow-prerelease-opam: true