submodule: bump openthread from `848de78` to `be10913`

[dependabot[bot]]

Bumps openthread from 848de78 to be10913.

Commits

• be10913 [spinel] remove dependency on ot core (#10212)
• 1ab2919 [routing-manager] signal table change on M/O flag update of routers (#10250)
• 16ee66a [routing-manager] fix received NA message min length check (#10256)
• 8c92497 [secure-transport] remove redundant null check (#10254)
• c8e2eb8 [mle] add helper method SetLeaderData(const LeaderData &) (#10245)
• f15dbd6 [dataset] add ContainsAllTlvs() helper method (#10249)
• 72f2df8 [gitignore] do not ignore .cmake files (#10247)
• See full diff in compare view

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