linter workflow: fix linter change test on test_package

[ericLemanissier]

it has been broken by #15005

---

• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[ericLemanissier]

the error was

line 10: syntax error near unexpected token `)'

broken runs:

• https://github.com/conan-io/conan-center-index/actions/runs/3803517584/jobs/6469976580#step:9:26
• https://github.com/conan-io/conan-center-index/actions/runs/4023629343/jobs/6914721612#step:9:26
• https://github.com/conan-io/conan-center-index/actions/runs/4023635893/jobs/6914735878#step:9:26

It now runs successfully: https://github.com/conan-io/conan-center-index/actions/runs/4024965319/jobs/6917586449#step:9:1

[ericLemanissier]

alternate take on the linter workflow in: #15500 which fixes the workflow even more