Fix action parameter name

Author: swallez

.github/workflows/release_central.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          ref: ${{ inputs.ref }}
+          ref: ${{ inputs.branch }}
           fetch-depth: '1'
       - name: Validate version
         shell: bash