[#8899] Update JDK8 of plugin test

[emeroad]

No description provided.

[codecov]

Codecov Report

Merging #8905 (b0e5f0d) into master (191de22) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #8905   +/-   ##
=========================================
  Coverage     39.94%   39.94%           
- Complexity    11653    11656    +3     
=========================================
  Files          3272     3272           
  Lines         89733    89733           
  Branches       9986     9986           
=========================================
+ Hits          35841    35842    +1     
  Misses        50826    50826           
+ Partials       3066     3065    -1     

Impacted Files	Coverage Δ
...rc/main/java/com/navercorp/pinpoint/test/Item.java	72.22% <0.00%> (-3.71%)	⬇️
...ercorp/pinpoint/rpc/server/HealthCheckManager.java	58.97% <0.00%> (-1.29%)	⬇️
...n/server/bo/serializer/trace/v2/SpanDecoderV0.java	81.73% <0.00%> (+0.45%)	⬆️
...n/server/bo/serializer/trace/v2/SpanEncoderV0.java	83.42% <0.00%> (+0.53%)	⬆️
...m/navercorp/pinpoint/rpc/client/ConnectFuture.java	79.16% <0.00%> (+8.33%)	⬆️

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