CI: update Cheshire integration branch

Author: ezelioli

.github/workflows/integration.yml

@@ -20,6 +20,6 @@ jobs:
           ip-name: cva6
           org: pulp-platform
           repo: cheshire
-          base-ref: cva6/pulp-v2.0.0-alpha.1
+          base-ref: 5e60c7d5bf9121bb6e901594a81e3ebf22b1279b
           token: ${{ secrets.CHESHIRE_TOKEN }}
           lifetime: 14