bugfix: v0 ByteBuf should not decode by super class

[Bughue]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

#6696

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 49.98%. Comparing base (1c0a442) to head (39ddd86).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6697      +/-   ##
============================================
- Coverage     50.81%   49.98%   -0.83%     
+ Complexity     5825     5734      -91     
============================================
  Files          1051     1051              
  Lines         36341    36334       -7     
  Branches       4321     4318       -3     
============================================
- Hits          18467    18163     -304     
- Misses        16014    16375     +361     
+ Partials       1860     1796      -64     

Files	Coverage Δ
...n/java/org/apache/seata/core/protocol/Version.java	63.04% <0.00%> (+1.34%)	⬆️
...che/seata/core/rpc/netty/v0/ProtocolDecoderV0.java	0.00% <0.00%> (-4.92%)	⬇️

... and 53 files with indirect coverage changes

[funky-eyes]

LGTM