submodule: bump openthread from `65bc830` to `a5c17b7`

[dependabot[bot]]

Bumps openthread from 65bc830 to a5c17b7.

Commits

• a5c17b7 [mle] MTD to handle udp time sync message (#9978)
• b146766 [plat-utils] enhance otMacFrameDoesAddrMatch() (#9997)
• e3f97e2 [netdata-publisher] distinguish SRP/DNS unicast entries (#9937)
• 223935b [logging] introduce LogWarnOnError() for standardized error logging (#9996)
• See full diff in compare view

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