Bump org.asynchttpclient:async-http-client from 2.12.4 to 3.0.9 and refactor DownloadZookeeperInitializer in /dubbo-test/dubbo-test-check

[zrlw]

What is the purpose of the change?

DownloadZookeeperInitializer.java needs to be fixed if bump org.asynchttpclient:async-http-client from 2.12.4 to 3.0.9
see details at #16212

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.34%. Comparing base (d95086c) to head (5bd75fb).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #16213      +/-   ##
============================================
- Coverage     60.79%   60.34%   -0.46%     
+ Complexity    11751    10238    -1513     
============================================
  Files          1953     1953              
  Lines         89119    89103      -16     
  Branches      13444    13360      -84     
============================================
- Hits          54179    53767     -412     
- Misses        29369    29690     +321     
- Partials       5571     5646      +75     

Flag	Coverage Δ
integration-tests-java21	?
integration-tests-java8	?
samples-tests-java21	32.17% <ø> (+0.05%)	⬆️
samples-tests-java8	29.85% <ø> (-0.01%)	⬇️
unit-tests-java11	59.01% <ø> (-0.02%)	⬇️
unit-tests-java17	58.50% <ø> (-0.04%)	⬇️
unit-tests-java21	58.50% <ø> (-0.02%)	⬇️
unit-tests-java25	58.47% <ø> (-0.01%)	⬇️
unit-tests-java8	?

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[zrlw]

async-http-client 3.0.9 should be used with jdk11+, but current dubbo still needs to support jdk8