submodule: bump third_party/openthread/repo from `bdb394e` to `62cac82` #5502

Job	Run time
Border Router (mDNSResponder)	30m 32s
Border Router (Avahi)	27m 44s
Border Router TREL (mDNSResponder)	28m 40s
Border Router TREL (Avahi)	30m 49s
Border Router MATN (mDNSResponder)	16m 54s
Border Router Internet Access Features (mDNSResponder)	22m 20s
Backbone Router	16m 21s
Border Router TREL with FEATURE_FLAG (avahi)	31m 11s
	3h 24m 31s

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