Tests: Update a test that relied on the Hello Dolly plugin version.

[43900] changed the plugin version, causing a unit test failure.

Merges [43902] to trunk.

See #45345.
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git-svn-id: https://core.svn.wordpress.org/trunk@44060 1a063a9b-81f0-0310-95a4-ce76da25c4cd