[Fix #12076] Explicitly require fileutils in RuboCop::Server::Cache

The "fileutils.rb" item is dynamically added to the `$LOADED_FEATURES` due to the autoloading when calling the `RuboCop::Server::Cache.dir`. Explicit require is added to achieve idempotency when initializing the `RuboCop::ResultCache.rubocop_required_features`. This change resolves the issue where the top level cache folder was named differently during two consecutive runs of rubocop.
rubocop · Oct 11, 2023 · 4025422 · 4025422
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diff --git a/changelog/fix_inconsistent_cache_key_caused_by_fileutils_require.md b/changelog/fix_inconsistent_cache_key_caused_by_fileutils_require.md
@@ -0,0 +1 @@
+* [#12076](https://github.com/rubocop/rubocop/issues/12076): Fixed an issue where the top-level cache folder was named differently during two consecutive rubocop runs. ([@K-S-A][])
diff --git a/lib/rubocop/server/cache.rb b/lib/rubocop/server/cache.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require 'fileutils'
 require 'pathname'
 require_relative '../cache_config'
 require_relative '../config_finder'