[ISSUE #8906] Handle string toUpperCase outside the loop

[mawen12]

Which Issue(s) This PR Fixes

Fixes #8906

Brief Description

Handle string toUpperCase outside the loop

How Did You Test This Change?

No test.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 47.52%. Comparing base (7eb16ff) to head (6883fb5).

Files with missing lines	Patch %	Lines
...ocketmq/proxy/remoting/MultiProtocolTlsHelper.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8907      +/-   ##
=============================================
- Coverage      47.54%   47.52%   -0.03%     
- Complexity     11728    11732       +4     
=============================================
  Files           1304     1304              
  Lines          91056    91058       +2     
  Branches       11677    11677              
=============================================
- Hits           43297    43276      -21     
- Misses         42409    42441      +32     
+ Partials        5350     5341       -9     

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