fix release

[till]

Not sure where this came from:

fatal: detected dubious ownership in repository at '/github/workspace'
To add an exception for this directory, call:

	git config --global --add safe.directory /github/workspace

But it probably needs to be added before the push action, and probably after checkout?

[parthshyara]

@till You can try using actions/checkout@v3. This might just fix the issue. Reference here.

[till]

Also fix badge:

![Gem (including prereleases)](https://img.shields.io/gem/v/apt-spy2?include_prereleases)

[till]

It seems the action I am using is abandoned. Maybe I should run bundle exec rake release myself.

[till]

Related: https://github.com/actions/runner-images/issues/6775