submodule: bump openthread from `830572f` to `d60aaab`

[dependabot[bot]]

Bumps openthread from 830572f to d60aaab.

Commits

• d60aaab [dtls] notify kDisconnectedLocalClosed when disconnect locally (#10653)
• f9349c1 [border-agent] not forward MGMT_GET/SET commands directly to leader (#10652)
• 45c5fe4 [posix] add radio URL parameter uart-init-deassert to deassert DTR and RTS ...
• 3a525f3 [radio] otPlatRadioGetNow fallback to otPlatTimeGet (#10646)
• f91610f [mle] include Supervision TLV only from sleepy child (#10628)
• 706013f [git-tool] explicit disable rebase (#10645)
• 95a4c33 [diag] support send security processed frames (#10640)
• a30cbda [mle] include Link Margin TLV in Child Update messages (#10626)
• e3f0a7c [radio-spinel] fix tracking of current MAC frame counter (#10635)
• 4465c9b [tests] optimize multi-ail test case to run three BRs on two infra link (#10637)
• Additional commits viewable in compare view

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