Update new-release-chart.yml

Author: valentijnscholten

.github/workflows/new-release-chart.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
         with:
-          ref: master
+          ref: ${{ github.event.inputs.release_number }}
           fetch-depth: 0
       - name: Get upload URL
         id: get-upload-url