

TITLE
model google/muril-base-cased has effectively infinite model_max_length

COMMENTS
2

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### System Info

```shell
>>> transformers.__version__
'4.18.0'
>>> tokenizers.__version__
'0.12.1'
```


### Who can help?

@LysandreJik
@SaulLu


### Information

- [ ] The official example scripts
- [X] My own modified scripts

### Tasks

- [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...)
- [X] My own task or dataset (give details below)

### Reproduction

The muril-base-cased model has the model_max_length filled out incorrectly.  For example:

```
>>> from transformers import AutoTokenizer
>>> tokenizer = AutoTokenizer.from_pretrained("google/muril-base-cased")
tokenizer.model_max_length
>>> tokenizer.model_max_length
1000000000000000019884624838656
```




### Expected behavior

I am fairly certain the correct size is 512
