Vagrantfile is out of date

[mikrl]

Environment:
OS: Debian GNU/Linux 11 (bullseye)
Other: Logged into vagrantcloud

Description:
Vagrant cannot be used to build MISP

Expected Behaviour:
Running vagrant up in the misp-vagrant dir brings up the project in a Vagrant box.

Actual Behaviour:
Vagrant fails to retrieve the specified box from vagrantcloud with a 404
Build terminates and MISP cannot be used

Steps to Reproduce:
$ cd misp-vagrant
$ vagrant up

Suggested Fix
Update the Vagrantfile to build MISP using a more recent version of Ubuntu

[defendable-hanspetter]

@mikrl Feel freee to checkout my pull request and see if it helps your issue.