submodule: bump third_party/openthread/repo from `a492d04` to `1e82c4e` #4999

Job	Run time
buildx (latest, ubuntu:bionic, linux/amd64,linux/arm/v7,linux/arm64, yes)	27m 11s
buildx (focal, ubuntu:focal, linux/amd64,linux/arm64, yes)	19m 1s
docker-check	3m 46s
buildx (jammy, ubuntu:jammy, linux/amd64,linux/arm64, yes)	18m 7s
buildx (reference-device, ubuntu:bionic, --build-arg REFERENCE_DEVICE=1 --build-arg BORDER_ROUTIN...	23m 27s
buildx (test, ubuntu:bionic, --build-arg OT_BACKBONE_CI=1 --build-arg REFERENCE_DEVICE=1 --build-...	27m 45s
	1h 59m 17s

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