Use GITHUB_TOKEN for releasing chart

https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token#about-the-github_token-secret

.github/workflows/chart-release.yml

@@ -12,5 +12,5 @@ jobs:
       - name: Publish Helm chart
         uses: stefanprodan/helm-gh-pages@master
         with:
-          token: ${{ secrets.BOT_GITHUB_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}
           charts_dir: charts