submodule: bump third_party/openthread/repo from `3560870` to `4e9d362` #5394

Job	Run time
Border Router (mDNSResponder)	30m 1s
Border Router (mDNSResponder)	30m 1s
Border Router (Avahi)	30m 2s
Border Router (Avahi)	30m 2s
Border Router TREL (mDNSResponder)	29m 39s
Border Router TREL (mDNSResponder)	29m 39s
Border Router TREL (Avahi)	29m 33s
Border Router TREL (Avahi)	29m 33s
Border Router MATN (mDNSResponder)	18m 12s
Border Router MATN (mDNSResponder)	18m 12s
Border Router Internet Access Features (mDNSResponder)	26m 34s
Border Router Internet Access Features (mDNSResponder)	26m 34s
Backbone Router	17m 20s
Backbone Router	17m 14s
Border Router TREL with FEATURE_FLAG (avahi)	29m 21s
Border Router TREL with FEATURE_FLAG (avahi)	29m 21s
	7h 1m 18s

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