[PR] [hotfix] Update Maven version recommendation to 3.9.16 [flink-connector-opensearch]

["spuru9 (via GitHub)" <gi...@apache.org>]

spuru9 opened a new pull request, #85:
URL: https://github.com/apache/flink-connector-opensearch/pull/85

   ## What is the purpose of the change
   
   Maven wrapper mention - `updating the Maven version requires updates to certain documentation and verification logic`.
   Also similar to what's being added in `apache/flink-connector-kafka#319`.
   
   ## Brief change log
   
   README update
   
   ## Verifying this change
   
   NA
   
   ## Does this pull request potentially affect one of the following parts:
   
   - Dependencies (does it add or upgrade a dependency): no
   - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
   - The serializers: no
   - The runtime per-record code paths (performance sensitive): no
   - Anything that affects deployment or recovery: no
   
   ## Documentation
   
   - Does this pull request introduce a new feature? no
   


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