Update renovate/renovate Docker tag to v43.257 (#45)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [renovate/renovate](https://renovatebot.com) ([source](https://github.com/renovatebot/renovate)) | container | minor | [`43.212-full` → `43.257-full`](https://octochangelog.com/compare?repo=renovatebot%2Frenovate&from=43.212&to=43.257) |

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This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yMTIuNCIsInVwZGF0ZWRJblZlciI6IjQzLjIxMi40IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Reviewed-on: #45
Co-authored-by: Renovate-Clanker <renovate-bot@fossy.my.id>
Co-committed-by: Renovate-Clanker <renovate-bot@fossy.my.id>

.gitea/workflows/renovate.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   renovate:
     runs-on: ubuntu-latest
-    container: renovate/renovate:43.255-full
+    container: renovate/renovate:43.257-full
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - run: renovate