optimize : compatible for client_protocol_version > server_protocol_version

[Bughue]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

fixes #7251

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 12 lines in your changes missing coverage. Please review.

Project coverage is 54.23%. Comparing base (6083fa1) to head (ca36b3d).

Files with missing lines	Patch %	Lines
...che/seata/core/rpc/netty/MultiProtocolDecoder.java	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7250      +/-   ##
============================================
- Coverage     54.23%   54.23%   -0.01%     
  Complexity     7267     7267              
============================================
  Files          1178     1178              
  Lines         41952    41958       +6     
  Branches       4923     4925       +2     
============================================
+ Hits          22753    22755       +2     
- Misses        17048    17052       +4     
  Partials       2151     2151              

Files with missing lines	Coverage Δ
...che/seata/core/rpc/netty/MultiProtocolDecoder.java	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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[slievrly]

LGTM