[8.x](backport #40734) testing: Fix Docker deprecation warnings #40843
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Proposed commit message
I stumbled upon some warnings when trying to start the integration testing environment. The logs don't cause any harm but they pollute the output of the tool. Warnings include:
Checklist
CHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.How to test this PR locally
cd testing/environments; make start ENV=snapshot.ymlThis is an automatic backport of pull request testing: Fix Docker deprecation warnings #40734 done by Mergify.