Upgrade to Jackson 2.7.3

Closes gh-5593

spring-boot-dependencies/pom.xml

@@ -89,7 +89,7 @@
 		<httpclient.version>4.5.2</httpclient.version>
 		<httpcore.version>4.4.4</httpcore.version>
 		<infinispan.version>8.1.2.Final</infinispan.version>
-		<jackson.version>2.7.2</jackson.version>
+		<jackson.version>2.7.3</jackson.version>
 		<janino.version>2.7.8</janino.version>
 		<javassist.version>3.18.1-GA</javassist.version> <!-- Same as Hibernate -->
 		<javax-cache.version>1.0.0</javax-cache.version>