Update PHP version in Scrutinizer configuration to 8.1

Fix keys processing in BulkLoader (#558)

Fix BulkLoader indexing with Stringable primary keys (#557)

Fix Belongs To Morphed behavior for custom ways (#556)

Fix BelongsToMorphed not clearing morph type on null relation (#555)

fix: Resolved bug when related fields were not filled (#550)

Revert avoiding shadow relations: a bug found in a side project

Remove deprecations; generate HasOne scope tests

fix(BulkLoader): Handle empty entity collection without throwing exce…

…ption (#543)

- Fix columns mapping in BelongsToMorphedLoader by @roxblnfk in #542