ci: use JSON format for __bootc_validation

[richm]

On some versions of ansible/jinja, the YAML format does not work, so use
the JSON format to pass in __bootc_validation

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

CI:

• Switch __bootc_validation extra variable from YAML to JSON syntax in GitHub Actions qemu-kvm integration tests

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