workflows: use github-hosted runner to speed up PR checks

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (b6a9fca) 85.62% compared to head (5ec630d) 85.70%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #99 +/- ## ========================================== + Coverage 85.62% 85.70% +0.08% ========================================== Files 188 188 Lines 16114 16114 ========================================== + Hits 13798 13811 +13 + Misses 1756 1741 -15 - Partials 560 562 +2 ``` | [Flag](https://app.codecov.io/gh/trpc-group/trpc-go/pull/99/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/trpc-group/trpc-go/pull/99/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group) | `85.70% <ø> (+0.08%)` | :arrow_up: | 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=trpc-group#carryforward-flags-in-the-pull-request-comment) to find out more. [see 7 files with indirect coverage changes](https://app.codecov.io/gh/trpc-group/trpc-go/pull/99/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group)

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