chore(go): go-openapi requires go.1.20 across the board

[codecov[bot]]

Codecov Report

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

Project coverage is 88.03%. Comparing base (a05020e) to head (3bdab0c). Report is 9 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #92 +/- ## ========================================== + Coverage 87.16% 88.03% +0.86% ========================================== Files 13 13 Lines 1839 1546 -293 ========================================== - Hits 1603 1361 -242 + Misses 204 153 -51 Partials 32 32 ``` | [Flag](https://app.codecov.io/gh/go-openapi/swag/pull/92/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | Coverage Δ | | |---|---|---| | [oldstable](https://app.codecov.io/gh/go-openapi/swag/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | `88.03% <ø> (+0.86%)` | :arrow_up: | | [stable](https://app.codecov.io/gh/go-openapi/swag/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | `88.03% <ø> (+0.86%)` | :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=go-openapi#carryforward-flags-in-the-pull-request-comment) to find out more.

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