[FLINK-31619] Upgrade Stateful Functions to Flink 1.16.2. This closes #331

* [FLINK-31619] Upgrade Stateful Functions to Flink 1.16.1

Upgrade Flink version to 1.16.2 (this has been released since the issue was created) and update dependency-confict resolutions.
Handle org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders moving to org.apache.flink.util.FlinkUserCodeClassLoaders.
Fix ReductionsTest.java.
Modify construction of Netty request headers
5 files changed