Fix Dialyzer warnings

lib/mix/tasks/pleroma/emoji.ex

lib/mix/tasks/pleroma/user.ex

lib/pleroma/activity.ex

lib/pleroma/activity/queries.ex

lib/pleroma/captcha/native.ex

lib/pleroma/conversation/participation.ex

lib/pleroma/mime.ex

lib/pleroma/object/containment.ex

lib/pleroma/user.ex

lib/pleroma/user/query.ex

lib/pleroma/user/search.ex

lib/pleroma/web/activity_pub/transmogrifier.ex

lib/pleroma/web/activity_pub/utils.ex

lib/pleroma/web/admin_api/search.ex

lib/pleroma/web/nodeinfo/nodeinfo_controller.ex

...eroma/web/pleroma_api/controllers/emoji_api_controller.ex