rename all migrations to 1.x

db/migrations/1.24_another_index_for_ex_termine.php

db/migrations/1.250_disable_archive_search.php

db/migrations/1.251_log_event_autoincrement.php

db/migrations/1.252_js_assets.php

db/migrations/1.253_adjust_token_table.php

db/migrations/1.254_hash_opengraph_table.php

db/migrations/1.255_tic9368_datafield_for_institution.php

db/migrations/1.256_tic9543_update_help_content.php

db/migrations/1.257_tic9544_add_external_id_semester.php

...grations/1.258_tic7443_create_lvgruppen_independently.php

db/migrations/1.259_migrations_reloaded.php

db/migrations/1.25_step_00098_user_domains.php

db/migrations/1.260_tfa.php

db/migrations/1.261_gradebook.php

db/migrations/1.262_blubbermessenger.php

db/migrations/1.263_blubbermessenger_keys.php

db/migrations/1.264_blubbermessenger_search.php

db/migrations/1.265_blubbermessenger_flat.php

db/migrations/1.266_consultations_option_exclude_expired.php

db/migrations/1.267_jsonapi_dangerous_routes_config.php