chore(ci): prevents duplicate workflow runs

[codecov[bot]]

Codecov Report

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

Comparison is base (fae44d9) 81.52% compared to head (0f6aa12) 81.52%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #117 +/- ## ======================================= Coverage 81.52% 81.52% ======================================= Files 12 12 Lines 2035 2035 ======================================= Hits 1659 1659 Misses 297 297 Partials 79 79 ``` | [Flag](https://app.codecov.io/gh/go-openapi/strfmt/pull/117/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/strfmt/pull/117/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | `81.52% <ø> (ø)` | | | [stable](https://app.codecov.io/gh/go-openapi/strfmt/pull/117/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | `81.52% <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=go-openapi#carryforward-flags-in-the-pull-request-comment) to find out more.

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