Mock v4.0 released (and mock-core-configs v38.5)

Hello maintainers! I'm glad I can announce that we have a new release of Mock v4.0 (the chroot build environment manager for building RPMs). There are two rather big things in this release, therefore the bump of the major version: - There's a new support for the DNF5 package manager (which should be the default one since Fedora 39) - The '--use-bootstrap-image' feature was fixed so it is less demanding, and thus newly works even if you run `mock --use-bootstrap-image` inside a Podman container (or toolbox). Full release notes: https://rpm-software-management.github.io/mock/Release-Notes-4.0 The updated packages are in Bodhi: [Fedora 38]: https://bodhi.fedoraproject.org/updates/FEDORA-2023-90a03d8d62 [Fedora 37]: https://bodhi.fedoraproject.org/updates/FEDORA-2023-5c8d906435 [EPEL 9]: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-74629814f7 [EPEL 8]: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-1652f46b68 Happy building! Pavel