ci(deps): bump renovate docker tag to v38.8.3 (#870)

| datasource | package                      | from   | to     |
| ---------- | ---------------------------- | ------ | ------ |
| docker     | ghcr.io/renovatebot/renovate | 38.7.1 | 38.8.3 |

Co-authored-by: mazi-renovate[bot] <161091290+mazi-renovate[bot]@users.noreply.github.com>

.github/workflows/renovate.yml

@@ -23,7 +23,7 @@ env:
   config_file: config.yaml
   # tool versions
   # renovate: datasource=docker depName=renovate packageName=ghcr.io/renovatebot/renovate
-  RENOVATE_VERSION: 38.7.1
+  RENOVATE_VERSION: 38.8.3
 
 jobs:
   renovate: