Upgrade to Joda Time 2.10.6

Closes gh-21187

Author: snicoll

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

@@ -131,7 +131,7 @@
 		<jetty-reactive-httpclient.version>1.0.3</jetty-reactive-httpclient.version>
 		<jmustache.version>1.15</jmustache.version>
 		<jna.version>4.5.2</jna.version>
-		<joda-time.version>2.10.5</joda-time.version>
+		<joda-time.version>2.10.6</joda-time.version>
 		<jolokia.version>1.6.2</jolokia.version>
 		<!-- Deprecated in favor of "johnzon.version" -->
 		<johnzon-jsonb.version>1.2.3</johnzon-jsonb.version>