Update dependency Spring Boot to 2.6.6 (#12463)

Author: puneetbehl

gradle.properties

@@ -37,7 +37,7 @@ scaffoldingCoreVersion=2.1.0
 servletApiVersion=4.0.1
 slf4jVersion=1.7.36
 spockVersion=2.1-groovy-3.0
-springBootVersion=2.6.5
+springBootVersion=2.6.6
 springLoadedVersion=1.2.8.RELEASE
 springVersion=5.3.18
 testingSupportVersion=2.4.1