Remove unused input in prep release example (#560)

Author: blink1073

example-workflows/prep-release.yml

@@ -39,7 +39,6 @@ jobs:
           version_spec: ${{ github.event.inputs.version_spec }}
           # silent: ${{ github.event.inputs.silent }}
           post_version_spec: ${{ github.event.inputs.post_version_spec }}
-          target: ${{ github.event.inputs.target }}
           branch: ${{ github.event.inputs.branch }}
           since: ${{ github.event.inputs.since }}
           since_last_stable: ${{ github.event.inputs.since_last_stable }}