Please rebuild bullseye64

[Tim Dittler <tim.dittler@systemli.org>]

Dear maintainers,

Thank you very much for providing these vagrant images. Can you please 
update the bullseye image now that it has become stable?

https://app.vagrantup.com/debian/boxes/bullseye64
The last image has been built 5 month ago.

I'm using it heavily with ansible and I always have to update apt cache 
and gather facts again so the machine learns it is a stable release now.

```
TASK [Gathering Facts] 
*********************************************************
ok: [instance]


TASK [vagrant-gather-test : debug] 
*********************************************
ok: [instance] => {
    "ansible_distribution_major_version": "testing/unstable"
}

TASK [vagrant-gather-test : apt] 
***********************************************
changed: [instance]

TASK [vagrant-gather-test : gather_facts] 
**************************************
ok: [instance]

TASK [vagrant-gather-test : debug] 
*********************************************
ok: [instance] => {
    "ansible_distribution_major_version": "11"
}
```

Thanks a lot and best regards,
Tim