docs: update references to ghcr.io/renovatebot/renovate to v36

| datasource | package                      | from     | to      |
| ---------- | ---------------------------- | -------- | ------- |
| docker     | ghcr.io/renovatebot/renovate | 35.103.0 | 36.40.3 |

README.md

@@ -135,7 +135,7 @@ The Renovate version to use.
 If omitted the action will use the `latest` Docker tag.
 Check [the available tags on Docker Hub](https://hub.docker.com/r/renovate/renovate/tags).
 
-This sample will use `ghcr.io/renovatebot/renovate:35.103.0` image.
+This sample will use `ghcr.io/renovatebot/renovate:36.40.3` image.
 
 ```yml
 ....
@@ -148,7 +148,7 @@ jobs:
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.0.1
         with:
-          renovate-version: 35.103.0
+          renovate-version: 36.40.3
           token: ${{ secrets.RENOVATE_TOKEN }}
 ```