Fix spring-kafka 2.7 mapping: Spring Boot 2.5.15 (2.6+ autoconfigure requires CommonErrorHandler from spring-kafka 2.8)

Author: wu-sheng

test/plugin/scenarios/spring-kafka-2.3.x-scenario/support-version.list

@@ -15,12 +15,12 @@
 # limitations under the License.
 
 # Format: spring-kafka-version[,key=value] — extra properties passed to Maven.
-# spring-kafka 2.7+ requires Spring Framework 5.3+ (ApplicationStartup class),
-# so those versions override spring.boot.version to match.
+# Spring Boot autoconfigure must match the spring-kafka version's expected APIs.
+# Mapping: https://spring.io/projects/spring-kafka#overview (compatibility matrix)
 2.3.10.RELEASE
 2.4.13.RELEASE
 2.5.17.RELEASE
 2.6.13
-2.7.14,spring.boot.version=2.7.18
+2.7.14,spring.boot.version=2.5.15
 2.8.11,spring.boot.version=2.7.18
 2.9.13,spring.boot.version=2.7.18