tracker: F45 change: Enforcing RPM signature checking by default

[marmijo]

Fedora 44 introduces the system‑wide change Enforcing signature checking by default, which tightens RPM’s default package verification behavior (via %_pkgverify_level and related settings). In the 2025-12-10 community meeting, we identified this as potentially impacting rpm-ostree layering. We need to ensure rpm-ostree continues to work correctly with the new defaults, especially for:

• Layering packages from Fedora’s signed repositories.
• The behavior and support expectations around layering custom/unsigned RPMs.

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• Fedora Change: https://fedoraproject.org/wiki/Changes/Enforcing_signature_checking_by_default
• Upstream tracker (rpm-osree): F45 Change: Enforcing signature checking by default rpm-ostree#5540

[travier]

Updated to F45.