fix: Fix DNSDaemonTest - remove flaky assertion

[usmansaleem]

PR description

fix: Fix DNSDaemonTest - remove flaky assertion

Fixed Issue(s)

fixes #7690

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Locally, you can run these tests to catch failures early:

• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests

[jframe]

Seems reasonable as we shouldn't need to rely on the vertx worker verticle still being there

[pinges]

LGTM