v2.3.0-M2

Change log:

5ec66b7 Upgrade versions; prepare for milestone release
8c7e4f9 GH-1236: Handle non-String contentType
165b838 GH-1237: RCFB Close key/trust store input streams
5b8b3dc Fix Sonar Issues
dc457b8 Add CorrelationData spring-messaging header
36e31be ReturnsListener whats-new.adoc
35a8ddc Fix tests for renamed returnsCallback property
94f59ab Fix call to deprecated return callback
985cf3c Simplify ReturnCallback for Lambdas
51e2ac8 Sonar Fix - reduce method complexity
30b10e1 GH-1230: Fix return/confirm delivery order
c413fdd Fix Sonar Issue
f04aa83 GH-1225: Fix Log4j2 Appender Termination
e6ae6cc Resolve Sonar Issues
73fdff5 Consistent Use of BDDMockito
c40b2b5 GH-1226: Fix Test Harness
9d6ce0d GH-1220: Fix Sonar Issue
7367bd7 Always Remove Test Exchanges in ERIT
e0ca772 GH-1220: Add replyContentType to @RabbitListener
91bd658 Configurable ResourceLoader for RabbitCFactoryBean
0674a3b Fix test for previous commit
4063b77 Enhance mocking in TestRabbitTemplateTests
cf221da GH-1219: Fix header mapping for replies (@sendto)