Fix flapping ista_ecotrend tests

[emontnemery]

Proposed change

Fix flapping ista_ecotrend tests

Tested locally with:
while pytest -vvx tests/components/ista_ecotrend/test_statistics.py --show-capture=no; do echo $((COUNTER++)); done

Without this change, the test tests/components/ista_ecotrend/test_statistics.py::test_statistics_import would fail around every 10 times. With this change, the test did not fail once after 200+ iterations.

Type of change

• Dependency upgrade
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• Breaking change (fix/feature causing existing functionality to break)
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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @tr4nt0r, mind taking a look at this pull request as it has been labeled with an integration (ista_ecotrend) you are listed as a code owner for? Thanks!

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[joostlek]

Oh good catch

[tr4nt0r]

@emontnemery Thanks for fixing this! 😊