4.3.6 Backported issues

[fmbenhassine]

• [doc] Wrong size for BATCH_JOB_INSTANCE.JOB_KEY in Appendix A Wrong size for BATCH_JOB_INSTANCE.JOB_KEY in Appendix A #4071
• Update copyright date Update copyright date #4084
• Fix Javadoc of SpringBatchTest annotation Fix Javadoc of SpringBatchTest annotation #4102
• NPE when creating MongoItemReader using a builder without specifying sorting NPE when creating MongoItemReader using a builder without specifying sorting #4082
• Incorrect documentation in "4.6.6 Abort a job" section Incorrect documentation in "4.6.6 Abort a job" section #4037
• Add java.util.UUID to the trusted classes list in Jackson2ExecutionContextStringSerializer Add java.util.UUID to the trusted classes list in Jackson2ExecutionContextStringSerializer #4110
• StaxEventItemWriter.unclosedHeaderCallbackElements prevents new job execution StaxEventItemWriter.unclosedHeaderCallbackElements prevents new job execution #4044
• Add @Nullable where appropriate in JobExecution and StepExecution Add @Nullable where appropriate in JobExecution and StepExecution #4077

[fmbenhassine]

Closing this since 4.3.6 has been released: https://github.com/spring-projects/spring-batch/releases/tag/4.3.6.