Update mdns to v0.0.12 to fix racy resolution

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (v2@8c013b0). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v2 #649 +/- ## ===================================== Coverage ? 22.30% ===================================== Files ? 37 Lines ? 4281 Branches ? 0 ===================================== Hits ? 955 Misses ? 3286 Partials ? 40 ``` | [Flag](https://app.codecov.io/gh/pion/ice/pull/649/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | Coverage Δ | | |---|---|---| | [wasm](https://app.codecov.io/gh/pion/ice/pull/649/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | `22.30% <0.00%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion#carryforward-flags-in-the-pull-request-comment) to find out more.

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