[loevgaard]

Summary

Rector 2.8 removed RectorConfig::cacheClass(), so vendor/bin/rector process --dry-run errors on highest deps, in the skeleton and in every plugin generated from it (seen on Setono/SyliusQuickpayPlugin#143, fixed there in Setono/SyliusQuickpayPlugin#144).

-use Rector\Caching\ValueObject\Storage\FileCacheStorage;
 ...
-    $rectorConfig->cacheClass(FileCacheStorage::class);
     $rectorConfig->cacheDirectory('./.build/rector');

FileCacheStorage is Rector's default cache storage, and the only one left in 2.8, so the cache behaviour is unchanged.

Evidence

rector process --dry-run with Rector 2.8.3, run on SyliusQuickpayPlugin's identical config:

• Before: [ERROR] Call to undefined method Rector\Config\RectorConfig::cacheClass()
  After: [OK] Rector is done!

Still [OK] on Rector 2.6.1. This PR's own coding-standards job runs it on the skeleton.

Merge Danger

Door: two-way

Blast Radius: none

Dev tooling config only; plugins already generated from the skeleton need the same two-line change.