FORMAT: enforce isinstance type checking

The pre-commits seem to have started failing due to a change in flake8. This MR fixes that.

added <10 lines Infrastructure Testing labels

mentioned in merge request !1286

added 1 commit

• 1e0adb99 - FORMAT: fix flake issue

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• 39b79e5d - TYPO: fix typo in type checking

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• bbb04518 - Update AUTHORS.md

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approved this merge request

merged

mentioned in commit 23159d45