ci(renovate): improve lockfileMaintenance updates

* Reduce schedule: we're getting security alerts before the 2 months have reached.
Instead of relying solely in vulnerability alerts PRs,
is better if we can solve them proactively,
hence updating lockfiles in a timely manner.

* Enable dependency dashboard,
requiring approvals for lockfileMaintenance updates:
As seen in
https://github.com/sindresorhus/eslint-plugin-unicorn/issues/2204#issuecomment-1781437403
we also might need to have our transitive and peer dependencies updated as well.
Having the ability to trigger the lockfile maintenance manually
it's a great QoL improvement for our workflow

That issue is also related to #1985, where the issue was first discovered

.github/renovate.json

@@ -45,10 +45,11 @@
       "matchUpdateTypes": [
         "lockFileMaintenance"
       ],
-      "groupSlug": "lockfiles"
+      "groupSlug": "lockfiles",
+      "dependencyDashboardApproval": true
     }
   ],
-  "dependencyDashboard": false,
+  "dependencyDashboard": true,
   "prConcurrentLimit": 0,
   "prHourlyLimit": 0,
   "transitiveRemediation": true,
@@ -79,7 +80,7 @@
   "lockFileMaintenance": {
     "enabled": true,
     "schedule": [
-      "every 2 months on the first day of the month"
+      "every month"
     ]
   },
   "assignees": [