test: fix linting issue caused by upgraded eslint

Tomas Vik (OOO back on 2026-08-31)requested to merge
fix-broken-master into main

The MR fixes an eslint issue:

Cannot use import declarations in modules that export using CommonJS (module.exports = 'foo' or exports.bar = 'hi')  import/no-import-module-exports

It broke master because the eslint upgrade wasn't reflected in the !395 (merged) MR.

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