update actions to push new release to krew-index

Author: rajatjindal

.github/workflows/release.yml

@@ -20,3 +20,7 @@ jobs:
         args: release --rm-dist
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Update new version in krew-index
+      uses: rajatjindal/krew-release-bot@v0.0.20
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}