data: libvirt: increase volume size to 32GB

[elfosardo]

The storage volume of the bootstrap VM with a max size of 20GB seems to be too small for OKD 4.13 with SCOS and 3 redfish-virtualmedia boot isos. Let's increase it to 32GB.

Fixes #6891

(cherry picked from commit 0ec3bf8)

[openshift-ci]

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[openshift-ci]

@elfosardo: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-metal-ipi-ovn-dualstack	1c50fd8	link	false	/test e2e-metal-ipi-ovn-dualstack
ci/prow/okd-scos-e2e-gcp	1c50fd8	link	false	/test okd-scos-e2e-gcp
ci/prow/okd-scos-e2e-gcp-ovn-upgrade	1c50fd8	link	false	/test okd-scos-e2e-gcp-ovn-upgrade
ci/prow/e2e-metal-single-node-live-iso	1c50fd8	link	false	/test e2e-metal-single-node-live-iso
ci/prow/e2e-metal-ipi-ovn-virtualmedia	1c50fd8	link	false	/test e2e-metal-ipi-ovn-virtualmedia
ci/prow/e2e-metal-assisted	1c50fd8	link	false	/test e2e-metal-assisted
ci/prow/e2e-metal-ipi-sdn	1c50fd8	link	false	/test e2e-metal-ipi-sdn
ci/prow/e2e-aws-ovn	1c50fd8	link	true	/test e2e-aws-ovn
ci/prow/e2e-libvirt	1c50fd8	link	false	/test e2e-libvirt
ci/prow/e2e-metal-ipi-ovn-ipv6	1c50fd8	link	true	/test e2e-metal-ipi-ovn-ipv6
ci/prow/e2e-metal-ipi-sdn-swapped-hosts	1c50fd8	link	false	/test e2e-metal-ipi-sdn-swapped-hosts

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