v5.5.5

Change log:

d61df01 Fix DSL sample in the doc
7e5fef9 GH-3641: Handle duplicate cookies properly
6c47593 Fix ExpressionUtilsTests according SF changes
1341a45 Upgrade dependencies
72b9e70 GH-3643: Defer MeterRegistry bean dependency
a03af08 Upgrade to Gradle 6.9.1; fork JavaCompile
34d2b09 Fix new Sonar smells
e2557a4 GH-3617: KPMH - Option To Use Template's Converter
0410343 Rework all the MQTT tests to JUnit 5
e7c0d8d GH-3432: Add MQTT v5 channel adapters (#3639)
b8e414d GH-3637: Fix KafkaMessageSource First Poll
fe57fd2 Checkstyle changes