submodule: bump openthread from `a7b429c` to `e0a1987` (#48)
submodule: bump openthread from `a7b429c` to `e0a1987` (#48)

Bumps [openthread](https://github.com/openthread/openthread) from `a7b429c` to `e0a1987`.
- [Commits](https://github.com/openthread/openthread/compare/a7b429c193fb6b00cdf217e0e0bac0784babf66a...e0a1987336de203cdae30f06ff16cc2309817387)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-nrf528xx,openthread/ot-nrf528xx