rename all migrations to 1.x

db/migrations/1.268_unrestricted_userdomains.php

db/migrations/1.269_fix_missing_consultation_events.php

db/migrations/1.26_step_00146_lock_rules2.php

db/migrations/1.270_step_00332_mvv_overlapping_courses.php

db/migrations/1.271_jsonapi_cors_origin_config.php

db/migrations/1.272_step_00338_instituteplaning.php

db/migrations/1.273_config_for_download_counter_display.php

...rations/1.274_add_enable_free_access_for_courses_only.php

db/migrations/1.275_additional_mvv_tables.php

db/migrations/1.276_tic8458_add_upload_description.php

db/migrations/1.277_room_management_migration.php

db/migrations/1.278_resize_auth_user_md5_email_field.php

db/migrations/1.279_config_wiki_comments_enable.php

db/migrations/1.27_step_147_mail_activationlink.php

db/migrations/1.280_step_00338_institutecolors.php

db/migrations/1.281_step_00333_feedback.php

db/migrations/1.282_config_for_stgteilversion_userfilter.php

db/migrations/1.283_add_filetypes.php

...tions/1.284_change_schedule_color_with_category_index.php

db/migrations/1.285_fixes_on_schedule_coloring.php