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 70.12%. Comparing base (5b90bc1) to head (09f4ad4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #241 +/- ## ========================================== - Coverage 70.26% 70.12% -0.14% ========================================== Files 77 77 Lines 4341 4341 ========================================== - Hits 3050 3044 -6 - Misses 1157 1161 +4 - Partials 134 136 +2 ``` | [Flag](https://app.codecov.io/gh/pion/interceptor/pull/241/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/interceptor/pull/241/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | `70.12% <ø> (-0.14%)` | :arrow_down: | | [wasm](https://app.codecov.io/gh/pion/interceptor/pull/241/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion) | `?` | | 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