Fix random behavior of update_model_index in pre-commit hook (#784)

.dev/md2yml.py

.pre-commit-config.yaml

configs/ann/ann.yml

configs/apcnet/apcnet.yml

configs/ccnet/ccnet.yml

configs/cgnet/cgnet.yml

configs/danet/danet.yml

configs/deeplabv3/deeplabv3.yml

configs/deeplabv3plus/deeplabv3plus.yml

configs/dmnet/dmnet.yml

configs/dnlnet/dnlnet.yml

configs/emanet/emanet.yml

configs/encnet/encnet.yml

configs/fastscnn/fastscnn.yml

configs/fcn/fcn.yml

configs/fp16/fp16.yml

configs/gcnet/gcnet.yml

configs/hrnet/hrnet.yml

configs/mobilenet_v2/mobilenet_v2.yml

configs/mobilenet_v3/mobilenet_v3.yml