Add default fork-token

prepare-release/action.yml

@@ -21,6 +21,7 @@ inputs:
     description: |
       GitHub token to create and push to the fork.
       Fine-grained PAT: `administration: write; contents: write`
+    default: ${{ inputs.token }}
 runs:
   using: composite
   steps:
@@ -79,13 +80,13 @@ runs:
       id: create-fork
       uses: conda/actions/create-fork@create-fork
       with:
-        token: ${{ inputs.fork-token || inputs.token }}
+        token: ${{ inputs.fork-token }}
 
     - name: Create PR
       uses: peter-evans/create-pull-request@5e914681df9dc83aa4e4905692ca88beb2f9e91f # v7.0.5
       with:
         # push to the fork
-        branch-token: ${{ inputs.fork-token || inputs.token }}
+        branch-token: ${{ inputs.fork-token }}
         push-to-fork: ${{ steps.create-fork.outputs.fork }}
         branch: changelog-${{ inputs.version }}
         commit-message: Changelog ${{ inputs.version }}