unicode: upgrade to Unicode 15.1.0

### Go version

go version go1.21.5 linux/amd64

### Output of `go env` in your module/workspace:

```shell
not applicable
```


### What did you do?

https://go.dev/play/p/9biSMo4sTqo

### What did you see happen?

15.0.0

### What did you expect to see?

15.1.0