Fix the issue where MergedAnnotation is null when retrieved in Spring 5.x

[jkoChen]

Added compatibility support for Spring 5.x in the method org.apache.dubbo.config.spring.util.AnnotationUtils#tryGetMergedAnnotation to ensure that MergedAnnotations can be correctly retrieved in Spring 5.x environments

What is the purpose of the change?

PR of the issue : #14104

I fixed this issue in Dubbo 3.2, but the code was reverted in version 3.3, so I need to fix it again.

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.01%. Comparing base (192d433) to head (2b86c1d).
⚠️ Report is 9 commits behind head on 3.3.

Files with missing lines	Patch %	Lines
...ache/dubbo/config/spring/util/AnnotationUtils.java	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                3.3   #15581   +/-   ##
=========================================
  Coverage     61.00%   61.01%           
- Complexity    11495    11500    +5     
=========================================
  Files          1909     1909           
  Lines         86777    86782    +5     
  Branches      13093    13094    +1     
=========================================
+ Hits          52942    52951    +9     
+ Misses        28416    28415    -1     
+ Partials       5419     5416    -3     

Flag	Coverage Δ
integration-tests-java21	32.95% <44.44%> (-0.07%)	⬇️
integration-tests-java8	33.06% <44.44%> (+<0.01%)	⬆️
samples-tests-java21	31.69% <44.44%> (+0.03%)	⬆️
samples-tests-java8	29.33% <44.44%> (+0.04%)	⬆️
unit-tests-java11	59.07% <44.44%> (+0.01%)	⬆️
unit-tests-java17	58.80% <44.44%> (+0.02%)	⬆️
unit-tests-java21	58.77% <44.44%> (+0.01%)	⬆️
unit-tests-java8	59.08% <44.44%> (+<0.01%)	⬆️

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