Fixed syntax in stale job

[codecov[bot]]

Codecov Report

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

Comparison is base (2e52968) 67.87% compared to head (5b5ca1c) 67.87%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #346 +/- ## ======================================= Coverage 67.87% 67.87% ======================================= Files 4 4 Lines 1074 1074 ======================================= Hits 729 729 Misses 235 235 Partials 110 110 ``` | [Flag](https://app.codecov.io/gh/aerokube/cm/pull/346/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aerokube) | Coverage Δ | | |---|---|---| | [go](https://app.codecov.io/gh/aerokube/cm/pull/346/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aerokube) | `67.87% <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=aerokube#carryforward-flags-in-the-pull-request-comment) to find out more.

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