Drupal 10, PHP 8.2 and PHPStan issues

[millnut]

The work on localgovdrupal/localgov_project#131 has highlighted some PHP 8.2 and PHPStan issues which need fixing.

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  Line   modules/contrib/localgov_workflows/modules/localgov_review_date/src/Plugin/Field/FieldType/ReviewDateItem.php                             
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  51     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$review.                               
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  51     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$review_langcode.                      
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  51     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$reviewed.                             
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  65     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$reviewed.                             
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  65     Method Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::postSave() should return bool but return statement is missing.  
  70     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$langcode.                             
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  78     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$review.                               
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  87     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$langcode.                             
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  96     Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$langcode.                             
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
  113    Access to an undefined property Drupal\localgov_review_date\Plugin\Field\FieldType\ReviewDateItem::$review.                               
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                      
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  Line   modules/contrib/localgov_workflows/tests/src/Functional/RequireLogTest.php                              
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  44     Access to an undefined property Drupal\Tests\localgov_workflows\Functional\RequireLogTest::$adminUser.  
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                    
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