submodule: bump openthread from `d48799d` to `48128ac`

[dependabot[bot]]

Bumps openthread from d48799d to 48128ac.

Commits

• 48128ac [ip6] remove default constructor for Ip6::Option (#8712)
• d0f6f8d [cli] add documentation for dns resolve4 command (#8710)
• 213792f [github-actions] update toranj-ncp to trigger on pull request only (#8648)
• 88b3367 [message] add WriteBytesFromMessage() and Remove/InsertHeader() (#8708)
• e5530a7 [ip6] refer to correct RFC in comments/docs (#8711)
• 632b630 [ip6] rename Option sub-classes (#8709)
• 7fc806f [test] move tcplp tests into unit workflow (#8707)
• 3eea48c [posix] remove Android.mk (#8706)
• 985f811 [mle] add API for changing number of child router links (#8410)
• c28bb19 [api] include mLinkMargin in otNeighborInfo (#8697)
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

Merging #462 (7a2d3a3) into main (4316559) will decrease coverage by 0.20%. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #462 +/- ## ========================================== - Coverage 50.08% 49.89% -0.20% ========================================== Files 38 38 Lines 4604 4604 ========================================== - Hits 2306 2297 -9 - Misses 2116 2125 +9 Partials 182 182 ``` | [Impacted Files](https://codecov.io/gh/openthread/ot-ns/pull/462?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openthread) | Coverage Δ | | |---|---|---| | [visualize/grpc/grpcServer.go](https://codecov.io/gh/openthread/ot-ns/pull/462?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openthread#diff-dmlzdWFsaXplL2dycGMvZ3JwY1NlcnZlci5nbw==) | `79.24% <0.00%> (-3.78%)` | :arrow_down: | | [web/web.go](https://codecov.io/gh/openthread/ot-ns/pull/462?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openthread#diff-d2ViL3dlYi5nbw==) | `47.61% <0.00%> (-3.18%)` | :arrow_down: | | [visualize/grpc/pb/visualize\_grpc.pb.go](https://codecov.io/gh/openthread/ot-ns/pull/462?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openthread#diff-dmlzdWFsaXplL2dycGMvcGIvdmlzdWFsaXplX2dycGMucGIuZ28=) | `19.42% <0.00%> (-0.45%)` | :arrow_down: |

[dependabot[bot]]

Superseded by #463.