chroma: submission error (rate limit exceeded)

### Problem

Running this command:

```sh
$ beet submit
```

Led to this problem:

```
[...]
chroma: acoustid submission error: error 14: rate limit (10.000000 requests per second) exceeded, try again later
```

### Setup

* OS: Fedora Linux 43 (Workstation Edition)
* Python version: 3.13.12
* beets version: 2.8.0
* Turning off plugins made problem go away (yes/no): no

My configuration (output of `beet config`) is:

```yaml
plugins:
- chroma
```