chore: use ESM-specific Renovate config (#273)

Author: ehmicky

renovate.json5

@@ -1,19 +1,8 @@
 {
-  extends: ['github>netlify/renovate-config:default'],
+  extends: ['github>netlify/renovate-config:esm'],
   ignorePresets: [':prHourlyLimit2'],
   semanticCommits: true,
   dependencyDashboard: true,
   automerge: true,
-  packageRules: [
-    {
-      packageNames: [
-        // Those cannot be upgraded to requiring ES modules
-        'strip-ansi',
-        'username',
-      ],
-      major: {
-        enabled: false,
-      },
-    },
-  ],
+  packageRules: [],
 }