Bump mysql-connector-java from 8.0.21 to 8.0.28

[Oliverwqcwrw]

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What is the purpose of the change

#8601

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Verifying this change

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[codecov-commenter]

Codecov Report

Merging #8623 (b9eb2ab) into develop (29b2fa4) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #8623      +/-   ##
=============================================
- Coverage      41.57%   41.57%   -0.01%     
+ Complexity      4458     4457       -1     
=============================================
  Files            882      882              
  Lines          32112    32124      +12     
  Branches        3719     3719              
=============================================
+ Hits           13350    13354       +4     
- Misses         17412    17417       +5     
- Partials        1350     1353       +3     

Impacted Files	Coverage Δ
...ba/nacos/core/distributed/distro/DistroConfig.java	85.71% <0.00%> (-4.99%)	⬇️
...os/client/auth/ram/identify/CredentialService.java	78.84% <0.00%> (-3.85%)	⬇️
.../core/v2/event/publisher/NamingEventPublisher.java	75.00% <0.00%> (-1.25%)	⬇️
...phemeral/distro/v2/DistroClientTransportAgent.java	3.33% <0.00%> (-0.03%)	⬇️
...stributed/distro/task/load/DistroLoadDataTask.java	55.00% <0.00%> (+2.27%)	⬆️

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