submodule: bump openthread from `be74a3c` to `a79ca11`

[dependabot[bot]]

Bumps openthread from be74a3c to a79ca11.

Commits

• a79ca11 [github-actions] use setup-python action (#10797)
• 8cb529b [test] add fake platform (#10594)
• f943729 [github-actions] remove g++multilib where unused (#10799)
• 7971508 [thread-cert] create internet directory for NAT64 and PD tests (#10794)
• 0e81aa1 [mle] update SendParentResponse() to use Child & input (#10801)
• ce57c5a [github-actions] simplify toranj-unittest (#10802)
• c027237 [mle] simplify condition in Mle::BecomeDetached() (#10796)
• See full diff in compare view

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