Update go.mod to 1.19

[codecov[bot]]

Codecov Report

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

Project coverage is 78.69%. Comparing base (bca4f2f) to head (f3b7403).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #667 +/- ## ========================================== - Coverage 78.75% 78.69% -0.07% ========================================== Files 42 42 Lines 4698 4698 ========================================== - Hits 3700 3697 -3 - Misses 767 769 +2 - Partials 231 232 +1 ``` | [Flag](https://app.codecov.io/gh/pion/ice/pull/667/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | Coverage Δ | | |---|---|---| | [go](https://app.codecov.io/gh/pion/ice/pull/667/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | `78.69% <ø> (-0.07%)` | :arrow_down: | | [wasm](https://app.codecov.io/gh/pion/ice/pull/667/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | `22.48% <ø> (ø)` | | 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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[edaniels]

Looks fine