Migrate Renovate config to JSON5 format

Replaces renovate.json with renovate.json5, updating the configuration to use JSON5 syntax and adding a $schema reference and lockFileMaintenance settings.

Delete renovate.json

Author: baseplate-admin

renovate.json

@@ -0,0 +1,18 @@
+{
+    $schema: 'https://docs.renovatebot.com/renovate-schema.json',
+    prConcurrentLimit: 100,
+    schedule: ['every friday'],
+    lockFileMaintenance: {
+        enabled: true,
+    },
+    packageRules: [
+        {
+            matchPackagePatterns: ['.*'],
+            matchManagers: ['cargo'],
+        },
+        {
+            matchPackagePatterns: ['.*'],
+            matchManagers: ['uv'],
+        },
+    ],
+}