[examples] Update Conan clean section according to Conan Example2 #4242
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This PR is based on the example2 update: conan-io/examples2#193
As it requires Conan 2.21.0 to follow the ListAPI update, this PR targets the develop2 branch.
I added a warning to remind users about using Conan 2.21.0 (too much?). Otherwise, they will have some Python error when trying to use it with older Conan versions.
Preview eb48af6