Merge pull request #3638 from rust-lang/renovate/migrate-config

Migrate renovate config

Author: ehuss

.github/renovate.json5

@@ -1,11 +1,11 @@
 {
     extends: [
-        "config:best-practices",
-        ":pinAllExceptPeerDependencies",
-        ":maintainLockFilesWeekly",
-        ":semanticCommitsDisabled",
-        ":label(not-rfc)",
-        "regexManagers:githubActionsVersions",
-        "schedule:monthly"
+        'config:best-practices',
+        ':pinAllExceptPeerDependencies',
+        ':maintainLockFilesWeekly',
+        ':semanticCommitsDisabled',
+        ':label(not-rfc)',
+        'customManagers:githubActionsVersions',
+        'schedule:monthly',
     ],
 }