submodule: bump third_party/openthread/repo from `7bd3abd` to `d16d16… #5441

Job	Run time
Border Router (mDNSResponder)	28m 38s
Border Router (mDNSResponder)	27m 50s
Border Router (Avahi)	29m 28s
Border Router (Avahi)	29m 28s
Border Router TREL (mDNSResponder)	30m 20s
Border Router TREL (mDNSResponder)	30m 20s
Border Router TREL (Avahi)	28m 16s
Border Router TREL (Avahi)	28m 16s
Border Router MATN (mDNSResponder)	17m 52s
Border Router MATN (mDNSResponder)	17m 52s
Border Router Internet Access Features (mDNSResponder)	23m 41s
Border Router Internet Access Features (mDNSResponder)	23m 41s
Backbone Router	20m 26s
Backbone Router	20m 26s
Border Router TREL with FEATURE_FLAG (avahi)	28m 30s
Border Router TREL with FEATURE_FLAG (avahi)	28m 30s
	6h 53m 34s

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