Upgrade terraform-provider-libvirt to v0.8.1

[pulumi-bot]

This PR was generated via $ upgrade-provider pulumi/pulumi-libvirt --kind=all.

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• Upgrading terraform-provider-libvirt from 0.8.0 to 0.8.1. Fixes #444

[github-actions[bot]]

Does the PR have any schema changes?

Looking good! No breaking changes found. No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[pulumi-bot]

This PR has been shipped in release v0.5.2.