Auto merge of #13106 - rust-lang:renovate/migrate-config, r=weihanglo

chore(config): migrate renovate config

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

The Renovate config in this repository needs migrating. Typically this is because one or more configuration options you are using have been renamed.

  You don't need to merge this PR right away, because Renovate will continue to migrate these fields internally each time it runs. But later some of these fields may be fully deprecated and the migrations removed. So it's a good idea to merge this migration PR soon.

#### [PLEASE NOTE](https://docs.renovatebot.com/configuration-options#configmigration): JSON5 config file migrated! All comments & trailing commas were removed.

🔕 **Ignore**: Close this PR and you won't be reminded about config migration again, but one day your current config may no longer be valid.

❓ Got questions? Does something look wrong to you? Please don't hesitate to [request help here](https://github.com/renovatebot/renovate/discussions).

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/rust-lang/cargo).

.github/renovate.json5

@@ -6,7 +6,7 @@
   configMigration: true,
   dependencyDashboard: false,
   ignorePaths: [
-    "**/tests/**",
+    '**/tests/**',
   ],
   customManagers: [
     {
@@ -40,7 +40,7 @@
     {
       commitMessageTopic: 'MSRV (1 version)',
       matchManagers: [
-        'regex',
+        'custom.regex',
       ],
       matchPackageNames: [
         'MSRV:1',
@@ -53,12 +53,12 @@
     {
       commitMessageTopic: 'MSRV (3 versions)',
       matchManagers: [
-        'regex',
+        'custom.regex',
       ],
       matchPackageNames: [
         'MSRV:3',
       ],
-      "extractVersion": "^(?<version>\\d+\\.\\d+)",  // Drop the patch version
+      extractVersion: '^(?<version>\\d+\\.\\d+)',  // Drop the patch version
       schedule: [
         '* * * * *',
       ],