Update TESTING.md

[selankon]

Add a warning advising that latest lime packages breaks the interfaces configurations

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d0c498f) 79.69% compared to head (528a28e) 79.71%. Report is 4 commits behind head on master.

:exclamation: Current head 528a28e differs from pull request most recent head 0758abb. Consider uploading reports for the commit 0758abb to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1065 +/- ## ========================================== + Coverage 79.69% 79.71% +0.02% ========================================== Files 53 53 Lines 4550 4550 ========================================== + Hits 3626 3627 +1 + Misses 924 923 -1 ```

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[ilario]

In my opinion, the solution is not to add a warning, but to fix the issue. If you don't want to put the link to an external website, you can either:

• ask @a-gave to copy those files on the official repo
• link these ones instead https://repo.libremesh.org/releases/2023.1-rc2-ow22/targets/x86/64/