Fix java 20 test failure

[spacether]

• Fixes the test that is breaking in java 20 but not earlier java versions

Verification:

• this tests is passing locally with java 20
• I was unable to get a CI config working that included java 20 + maven

Note: this may fix building for java 20: #242

PR checklist

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  ./bin/utils/export_docs_generators.sh
  

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