check hypothesis why CI might fail on windows

[anton-trunov]

Closes #318

• I have updated CHANGELOG.md
• I have added tests to demonstrate the contribution is correctly implemented: this usually includes both positive and negative tests, showing the happy path(s) and featuring intentionally broken cases
• I have run all the tests locally and no test failure was reported
• I have run the linter, formatter and spellchecker
• I did not do unrelated and/or undiscussed refactorings

[novusnota]

By default CI on Windows is being run in pwsh, not powershell, which may be the cause of the issue. Previously the default was cmd, so we may try to explicitly set:

defaults:
  run:
    shell: cmd

https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_iddefaultsrunshell

P.S.: It seems no one on the team has a Windows machine anymore :)