Update Renovate config

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| caddy | final | digest | `70e816c` → `c3d7ee5` |

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### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4wLjgiLCJ1cGRhdGVkSW5WZXIiOiI0My44LjUiLCJ0YXJnZXRCcmFuY2giOiJtYXN0ZXIiLCJsYWJlbHMiOlsicmVub3ZhdGUiXX0=-->

Reviewed-on: #6
Co-authored-by: Renovate Bot <renovate-bot@valverde.cloud>
Co-committed-by: Renovate Bot <renovate-bot@valverde.cloud>

.gitea/workflows/build.yaml

@@ -26,7 +26,7 @@ jobs:
 
       - name: Parse Caddy version
         id: version
-        run: echo "version=$(grep -Eo 'caddy:[0-9]+\.[0-9]+\.[0-9]+$' ./Dockerfile | cut -d ':' -f2)" | tee -a $GITEA_OUTPUT
+        run: echo "version=$(grep -Eo 'caddy:[0-9]+\.[0-9]+\.[0-9]+' ./Dockerfile | head -1 | cut -d ':' -f2)" | tee -a $GITEA_OUTPUT
 
       - name: Generate Docker metadata
         id: meta

renovate.json

@@ -7,12 +7,11 @@
   "labels": ["renovate"],
   "configMigration": true,
   "prHourlyLimit": 0,
-  "docker-compose": {
-    "hostRules": [
+  "packageRules": [
     {
-        "matchHost": "docker.io",
-        "concurrentRequestLimit": 2
+      "matchPackageNames": ["*"],
+      "groupName": "all dependencies",
+      "groupSlug": "all-deps"
     }
   ]
-  }
 }