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a7ec88ad61
Use cmd instead of new default shell for `call`.
https://github.blog/changelog/2019-10-17-github-actions-default-shell-on-windows-runners-is-changing-to-powershell/
7bcc639c72/checks (step):6:5
```
call : The term 'call' is not recognized as the name of a cmdlet, function, script file, or operable program.
```