Update ShenyuClientShutdownHook.java

[wanyaoasiainfo]

Print error log

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #4780 (7383713) into master (42689ca) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #4780      +/-   ##
============================================
- Coverage     65.63%   65.62%   -0.01%     
- Complexity     8144     8148       +4     
============================================
  Files          1133     1133              
  Lines         33161    33162       +1     
  Branches       2969     2969              
============================================
  Hits          21764    21764              
- Misses         9666     9667       +1     
  Partials       1731     1731              

Impacted Files	Coverage Δ
...client/core/shutdown/ShenyuClientShutdownHook.java	0.00% <0.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more