Upgrade Git Hub actions/checkout@v1 to v2

There is a issue when we need to re-run a failed scenario, it always fails to checkout:

git checkout --progress --force a7d8e1c508ca5f21df0c96c232d2b860b8650ec0
##[error]fatal: reference is not a tree: a7d8e1c508ca5f21df0c96c232d2b860b8650ec0
Removed matchers: 'checkout-git'

For more information, see https://github.com/actions/checkout/issues/23

In addition we need to fix this issue while trying to install the xmllint, the package libxml2-utils was returning 404.
Apparently there is a need to run update before install it.