Fix junit upgrade issue

[gtn1024]

Use junit 5 api for unit test

[codecov-commenter]

Codecov Report

Merging #166 (29f4f0f) into main (4c5dcb0) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #166   +/-   ##
=========================================
  Coverage     69.77%   69.77%           
  Complexity     8644     8644           
=========================================
  Files           411      411           
  Lines         44491    44491           
  Branches       8891     8891           
=========================================
+ Hits          31042    31045    +3     
+ Misses         9799     9796    -3     
  Partials       3650     3650           

Impacted Files	Coverage Δ
...in/java/com/alibaba/fastjson2/JSONWriterJSONB.java	58.27% <0.00%> (+0.09%)	⬆️
...ain/java/com/alibaba/fastjson2/JSONWriterUTF8.java	73.88% <0.00%> (+0.12%)	⬆️
core/src/main/java/com/alibaba/fastjson2/JSON.java	89.69% <0.00%> (+0.23%)	⬆️

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