Remove charmcraft beta channel (#365)

charmcraft 2.5.4 was released to stable

Author: carlcsaposs-canonical

.github/workflows/ci.yaml

@@ -39,7 +39,6 @@ jobs:
     uses: canonical/data-platform-workflows/.github/workflows/[email protected]
     with:
       cache: true
-      charmcraft-snap-channel: beta
 
   integration-test:
     strategy:

.github/workflows/release.yaml

@@ -34,8 +34,6 @@ jobs:
   build:
     name: Build charm
     uses: canonical/data-platform-workflows/.github/workflows/[email protected]
-    with:
-      charmcraft-snap-channel: beta
 
   release:
     name: Release charm