atf: import atf-0.26vendor/atf/atf-0.26

This change imports 0.26 release content from [upstream][1].

The atf-0.26 artifact was been verified by [SHA256 checksum][2].

This update pulls in a large number of memory management fixes, polished upstreamed
content from contrib/atf in FreeBSD (proper), etc.

Please note that this new version requires a C++-20 compatible toolchain
to build.

More information about the release (from a high level) can be found in
the [release notes][3].

Updated via [`update_atf.sh`][4] using `update_atf.sh 0.26 atf-0.26`.

1: https://github.com/freebsd/atf/releases/download/atf-0.26/atf-0.26.tar.gz
2: https://github.com/freebsd/atf/releases/download/atf-0.26/atf-0.26.tar.gz.sha256
3: https://github.com/freebsd/atf/blob/atf-0.26/NEWS.md
4: https://codeberg.org/ngie/freebsd-powertools:shell/update_atf.sh@10a04edb

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