[FuturWarning] Add futur warning for LEDForSequenceClassification (#19066)
* fix led eos_mask
* add Futur Warning
* revert uselesss cahnges
* Update src/transformers/models/led/modeling_led.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>