submodule: bump openthread from `9e4cbb8` to `922059c`

[dependabot[bot]]

Bumps openthread from 9e4cbb8 to 922059c.

Commits

• 922059c [dataset] simplify dataset manager MGMT_SET request handling (#10139)
• d8e3e83 [dataset] simplify SendSetRequest (#10135)
• 485cb18 [dataset] add ValidateTlvs(), helper methods, and unit test (#10111)
• b8f036a [simulation] remove example log lines from otPlatLogCrashDump() (#10137)
• f404a22 [spinel] remove mIsCoprocessorReady flag check (#10144)
• 3517e6c [routing-manager] remove unused method (#10142)
• 2b65a63 [routing-manager] update and simplify comments (#10141)
• See full diff in compare view

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