[Fix] Remove _delete_=True in optimizer

configs/beit/upernet_beit-base_8x2_640x640_160k_ade20k.py

...s/beit/upernet_beit-large_fp16_8x1_640x640_160k_ade20k.py

...netv2/bisenetv2_fcn_fp16_4x4_1024x1024_160k_cityscapes.py

...onvnext/upernet_convnext_base_fp16_512x512_160k_ade20k.py

...onvnext/upernet_convnext_base_fp16_640x640_160k_ade20k.py

...nvnext/upernet_convnext_large_fp16_640x640_160k_ade20k.py

...nvnext/upernet_convnext_small_fp16_512x512_160k_ade20k.py

...onvnext/upernet_convnext_tiny_fp16_512x512_160k_ade20k.py

...vnext/upernet_convnext_xlarge_fp16_640x640_160k_ade20k.py

configs/dpt/dpt_vit-b16_512x512_160k_ade20k.py

configs/fcn/fcn_r101-d8_fp16_512x1024_80k_cityscapes.py

configs/mae/upernet_mae-base_fp16_8x2_512x512_160k_ade20k.py

...igs/pspnet/pspnet_r101-d8_fp16_512x1024_80k_cityscapes.py

...net_r50-d32_rsb-pretrain_512x1024_adamw_80k_cityscapes.py

...pnet_r50-d8_rsb-pretrain_512x1024_adamw_80k_cityscapes.py

configs/segformer/segformer_mit-b0_512x512_160k_ade20k.py

...gformer/segformer_mit-b0_8x1_1024x1024_160k_cityscapes.py

...patch4_window7_512x512_160k_ade20k_pretrain_224x224_1K.py

...twins/twins_pcpvt-s_fpn_fpnhead_8x4_512x512_80k_ade20k.py

...s/twins/twins_pcpvt-s_uperhead_8x4_512x512_160k_ade20k.py