[Mailer] [Sendgrid] Use `DataPart::getContentId()` when `DataPart::setContentId()` is used#54837

fabpot merged 1 commit intosymfony:6.4symfony/symfony:6.4from

SherinBloemendaal:sendgrid-inline-content-identifierSherinBloemendaal/symfony:sendgrid-inline-content-identifierCopy head branch name to clipboard