Make methods synchronized to match parent declaration

[sconvent]

What is the purpose of the change

Some methods are declared to not be synchronized, but they override a synchronized method declared in their parent.
This practically breaks the contract stated by the parent class. I'm not aware of any actual problem that this causes but nontheless, it should be fixed.

Brief changelog

Adding a synchronized statement to overriding methods that were missing it.

Verifying this change

Not really testable, so there is no way to verify it.

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #11383 (8be9253) into 3.2 (54bb276) will decrease coverage by 4.82%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #11383      +/-   ##
============================================
- Coverage     69.63%   64.81%   -4.82%     
+ Complexity      133       14     -119     
============================================
  Files          1515     1487      -28     
  Lines         82452    62370   -20082     
  Branches      14757     9133    -5624     
============================================
- Hits          57415    40425   -16990     
+ Misses        20199    17727    -2472     
+ Partials       4838     4218     -620     

Impacted Files	Coverage Δ
.../org/apache/dubbo/common/cache/FileCacheStore.java	84.09% <ø> (-8.28%)	⬇️
...n/java/org/apache/dubbo/common/io/StreamUtils.java	84.04% <ø> (-2.13%)	⬇️
...ubbo/remoting/buffer/ChannelBufferInputStream.java	94.44% <ø> (ø)
...luster/router/script/ScriptStateRouterFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...he/dubbo/test/common/impl/GreetingServiceImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...zookeeper/curator/CuratorZookeeperTransporter.java	0.00% <0.00%> (-100.00%)	⬇️
.../serialize/hessian2/Hessian2SerializerFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...nfigure/DubboRelaxedBinding2AutoConfiguration.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/dubbo/test/spring/SpringXmlConfigTest.java	0.00% <0.00%> (-96.16%)	⬇️
...egistrycenter/context/ZookeeperWindowsContext.java	0.00% <0.00%> (-81.82%)	⬇️
... and 481 more

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[AlbumenJ]

LGTM

[AlbumenJ]

Thanks for your contribution :)