submodule: bump openthread from `32f462f` to `cb1220d`

[dependabot[bot]]

Bumps openthread from 32f462f to cb1220d.

Commits

• cb1220d [cli] fix unused retval warning on otPlatLogCrashDump() call (#10369)
• 4a0d6b7 [test] update key-increment test scripts to align with cert test (#10347)
• 9c1f1f3 [key-manager] update how the "Key Switch Guard Timer" is reset (#10347)
• 185b0e1 [posix] improve the logging in netif (#10362)
• See full diff in compare view

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