Merge pull request #3757 from nextcloud/techdept/psalm-errors-2

.github/workflows/static-analysis.yml

lib/BackgroundJob/CleanupJob.php

lib/Command/CreateAccount.php

lib/Contracts/IMailManager.php

lib/Contracts/IMailTransmission.php

lib/Controller/AccountsController.php

lib/Controller/MailboxesController.php

lib/Controller/MessagesController.php

lib/Controller/SettingsController.php

lib/Db/MessageMapper.php

lib/Mailbox.php

lib/Model/IMAPMessage.php

lib/Model/IMessage.php

lib/Model/Message.php

lib/Service/AccountService.php

lib/Service/AutoCompletion/AddressCollector.php

lib/Service/AutoConfig/SmtpConnectivityTester.php

lib/Service/Avatar/Downloader.php

...fication/FeatureExtraction/ImportantMessagesExtractor.php

...lassification/FeatureExtraction/ReadMessagesExtractor.php