[SPARK-45032] Fix compilation warnings related to `Top-level wildcard is not allowed and will error under -Xsource:3` - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 4.0.0
Fix Version/s: 4.0.0
Component/s: Connect
Labels:
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Description

[warn] /Users/yangjie01/SourceCode/git/spark-mine-sbt/connector/connect/server/src/main/scala/org/apache/spark/sql/connect/service/ExecuteHolder.scala:175:32: [deprecation @  | origin= | version=2.13.7] Top-level wildcard is not allowed and will error under -Xsource:3
[warn]   def removeGrpcResponseSender[_](sender: ExecuteGrpcResponseSender[_]): Unit = synchronized {