Resolve #3289293 "Drupal 10"

Closes #3289293

This merge request consists of 3 commits:

• Adding Drupal 10 to core requirement in .info
• Replacing deprecated method isSubclassOf() with entityClassImplements()
• Replacing t() with $this->t()

@amatzies looks like not all entries of the isSubclassOf() have been replaced. I got next error during a new field creation:

Error: Call to undefined method Drupal\Core\Entity\ContentEntityType::isSubclassOf() in Drupal\reference_value_pair\Plugin\Field\FieldType\ReferenceValuePair::propertyDefinitions() (line 73 of /code/web/modules/dev/reference_value_pair/src/Plugin/Field/FieldType/ReferenceValuePair.php).

See the https://git.drupalcode.org/project/reference_value_pair/-/blob/master/src/Plugin/Field/FieldType/ReferenceValuePair.php#L73.

merged

Thanks for the MR!

resolved all threads