Revert "Upgrade to Jackson 2.9.4"

This reverts commit d908d0e876.

See gh-11830

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -69,7 +69,7 @@
 		<httpcore.version>4.4.9</httpcore.version>
 		<infinispan.version>9.1.4.Final</infinispan.version>
 		<influxdb-java.version>2.8</influxdb-java.version>
-		<jackson.version>2.9.4</jackson.version>
+		<jackson.version>2.9.2</jackson.version>
 		<janino.version>3.0.8</janino.version>
 		<javassist.version>3.22.0-CR2</javassist.version> <!-- Same as Hibernate -->
 		<javax-annotation.version>1.3.1</javax-annotation.version>