[TASK] Make migration wizard run at TYPO3 LTS 9

.gitlab-ci.yml

Classes/Command/MigrateCalEntriesToCalendarCommand.php

Classes/Domain/Repository/CalRepository.php

...ervice/MigrateCalCalendarsToCalendarFoundationService.php

.../Service/MigrateCalEntriesToCalendarFoundationService.php

...ateCalCalendarsToCalendarFoundationLegacyUpdateWizard.php

...e/MigrateCalCalendarsToCalendarFoundationUpdateWizard.php

...grateCalEntriesToCalendarFoundationLegacyUpdateWizard.php

...ate/MigrateCalEntriesToCalendarFoundationUpdateWizard.php

Configuration/Commands.php

Configuration/TCA/Overrides/tx_calendar_entry.php

Resources/Private/Language/locallang_db.xlf

...ice/MigrateCaCalendarsToCalendarFoundationServiceTest.php

...vice/MigrateCalEntriesToCalendarFoundationServiceTest.php

composer.json

ext_localconf.php

ext_tables.sql