fix(docs): update docker documentation

docs/self-hosting.md

@@ -21,9 +21,9 @@ Renovate is available for Docker via an automated build [renovate/renovate](http
 
 ```
 $ docker run renovate/renovate
-$ docker run renovate/renovate:11.32.3
-$ docker run renovate/renovate:11.32
-$ docker run renovate/renovate 11
+$ docker run renovate/renovate:12.1.1
+$ docker run renovate/renovate:12.1
+$ docker run renovate/renovate:12
 ```
 
 If you wish to configure Renovate using a `config.js` file then map it to `/usr/src/app/config.js` using Docker volumes.