fix the failing renovate validation check (#322)

### Description

our validation check for the renovate config has been failing. 

1. use a specific gh action since calling the npx action now requires
some other config to work
2. the schema needed to be migrated

<!-- start pr-codex -->

---

## PR-Codex overview
The focus of this PR is to update Renovate configuration and CI workflow
setup.

### Detailed summary
- Updated Renovate base configuration
- Changed Node setup in CI workflow
- Added validation steps for team and repo configurations in CI workflow

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your
question}`

<!-- end pr-codex -->

.github/workflows/ci.yml

@@ -410,11 +410,18 @@ jobs:
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v4
-      - name: Setup Node.js
+      - name: "Setup Node"
         uses: actions/setup-node@v4
         with:
-          node-version: 20.x
-      - name: Validate Renovate Config
-        run: |
-          npm install --global renovate
-          renovate-config-validator
+          node-version: 20.x  
+      - name: Validate Team Config    
+        uses: suzuki-shunsuke/[email protected]
+        with:
+          config_file_path: dt-renovate-base.json
+          strict: "false" 
+      - name: Validate Repo Config  
+        uses: suzuki-shunsuke/[email protected]
+        with:
+          config_file_path: renovate.json
+          strict: "false"
+

dt-renovate-base.json

@@ -1,20 +1,16 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "local>celo-org/.github:renovate-config"
-  ],
+  "extends": ["local>celo-org/.github:renovate-config"],
   "prCreation": "not-pending",
   "prConcurrentLimit": 2,
   "minimumReleaseAge": "5 days",
   "rangeStrategy": "bump",
-  "major": {
-    "minimumReleaseAge": "14 days"
-  },
+  "major": {"minimumReleaseAge": "14 days"},
   "packageRules": [
     {
       "matchManagers": ["github-actions"],
       "automerge": true,
-      "autoApprove": "true",
+      "autoApprove": true,
       "prCreation": "status-success"
     }
   ]