Release 0.20.3

# History

## 0.20.3

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.20.3/bootstrap.sh
sudo DOKKU_TAG=v0.20.3 bash bootstrap.sh
```

### New Features

- #3926: @josegonzalez Add proper support for various buildpack urls

### Other

- #3928: @dependabot-preview[bot] chore(deps): bump google.golang.org/grpc from 1.28.0 to 1.28.1 in /tests/apps/gogrpc
- #3925: @dependabot-preview[bot] chore(deps): bump flask from 1.1.1 to 1.1.2 in /tests/apps/python-flask
- #3924: @dependabot-preview[bot] chore(deps): bump flask from 1.1.1 to 1.1.2 in /tests/apps/multi

docs/assets/versions.json

@@ -17,6 +17,6 @@
     "0.17.9",
     "0.18.5",
     "0.19.13",
-    "0.20.2"
+    "0.20.3"
   ]
 }