submodule: bump openthread from `f12785d` to `02acc48`

[dependabot[bot]]

Bumps openthread from f12785d to 02acc48.

Commits

• 02acc48 [routing-manager] ignore checksum in RA hash calculation (#10230)
• 83e2732 [dataset] simplify dataset Save() methods (#10227)
• e27885e [routing-manager] track origin of received RA messages (#10229)
• e47973a [routing-manager] add section comments (#10228)
• a074684 [clang-format] accept different patch versions of clang-format (#10042)
• See full diff in compare view

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