submodule: bump openthread from `830572f` to `a0ba929`

[dependabot[bot]]

Bumps openthread from 830572f to a0ba929.

Commits

• a0ba929 [mle] add RLOC16 related helper methods in Mle (#10440)
• e10a925 [srp] fix otSrpClientStart documentation (#10435)
• 7ca21a3 [tlv] ensure handling of extended TLVs when iterating over sub-TLVs (#10439)
• f2ed3e9 [dns-client] switch to separate SRV/TXT queries on response timeout (#10444)
• 7252cad [posix] skip 0x00 bytes at the start of the received SPI frame (#10442)
• 975ffd7 [meshcop] simplify appending and parsing of NetworkNameTlv (#10441)
• 21b5764 [child] add GetIp6Addresses() and simplify MLR state tracking (#10424)
• c8681ff [routing-manager] centralize RxRaTracker decision logic and signaling (#10389)
• 588dfae [posix] check the max number of RCP supported sleepy children (#10399)
• cc8f66c [core] use RLOC16-related constants and methods consistently across modules (...
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