chore: Update Renovate configuration to use new defaults (#142)

### **PR Type**
Enhancement, Other


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### **Description**
- Switch Renovate preset to shared defaults

- Reformat JSON indentation consistently


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### Diagram Walkthrough


```mermaid
flowchart LR
  local["Local renovate.json"] -- "extends" --> preset["github>gander-settings/renovate:defaults"]
```



<details> <summary><h3> File Walkthrough</h3></summary>

<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Configuration
changes</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>renovate.json</strong><dd><code>Point Renovate to
shared defaults preset</code>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; </dd></summary>
<hr>

renovate.json

<ul><li>Replace <code>config:recommended</code> with
<br><code>github>gander-settings/renovate:defaults</code><br> <li>
Normalize JSON indentation to two spaces</ul>


</details>


  </td>
<td><a
href="https://github.com/gander-tools/playground-js-lib/pull/142/files#diff-7b5c8955fc544a11b4b74eddb4115f9cc51c9cf162dbffa60d37eeed82a55a57">+4/-4</a>&nbsp;
&nbsp; &nbsp; </td>

</tr>
</table></td></tr></tr></tbody></table>

</details>

___

Author: gander

renovate.json

@@ -1,6 +1,6 @@
 {
-    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-    "extends": [
-        "config:recommended"
-    ]
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>gander-settings/renovate:defaults"
+  ]
 }