Update runc binary to v1.2.6

[austinvazquez]

Release notes: https://github.com/opencontainers/runc/releases/tag/v1.2.6

This is the sixth patch release in the 1.2.z series of runc.
It primarily fixes an issue with runc exec vs time namespace,
and a compatibility issue with older kernels.
Fixed
Fix a stall issue that would happen if setting O_CLOEXEC with
CloseExecFrom failed (opencontainers/runc#4647).
runc now properly handles joining time namespaces (such as with
runc exec). Previously we would attempt to set the time offsets
when joining, which would fail. (opencontainers/runc#4635, opencontainers/runc#4649)
Handle EINTR retries correctly for socket-related direct
golang.org/x/sys/unix system calls. (opencontainers/runc#4650)
We no longer use F_SEAL_FUTURE_WRITE when sealing the runc binary, as it
turns out this had some unfortunate bugs in older kernel versions and was
never necessary in the first place. (opencontainers/runc#4651, opencontainers/runc#4640)
Removed
Remove Fexecve helper from libcontainer/system. Runc 1.2.1 removed
runc-dmz, but we forgot to remove this helper added only for that. (opencontainers/runc#4646)
Changed
Use Go 1.23 for official builds, run CI with Go 1.24 and drop Ubuntu 20.04
from CI. We need to drop Ubuntu 20.04 from CI because Github Actions
announced it's already deprecated and it will be discontinued soon. (opencontainers/runc#4648)

Diff: opencontainers/runc@v1.2.5...v1.2.6

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[austinvazquez]

/test all

[mikebrow]

LGTM

[djdongjin]

/cherrypick release/2.0 release/1.7 release/1.6

[k8s-infra-cherrypick-robot]

@djdongjin: new pull request created: #11583

In response to this:

/cherrypick release/2.0 release/1.7 release/1.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[djdongjin]

/cherrypick release/1.7

[djdongjin]

/cherrypick release/1.6

[k8s-infra-cherrypick-robot]

@djdongjin: new pull request created: #11584

In response to this:

/cherrypick release/1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@djdongjin: new pull request created: #11585

In response to this:

/cherrypick release/1.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.