Upgrade to GemFire 8.2.4

Closes gh-8948

spring-boot-dependencies/pom.xml

@@ -75,7 +75,7 @@
 		<flyway.version>3.2.1</flyway.version>
 		<freemarker.version>2.3.26-incubating</freemarker.version>
 		<elasticsearch.version>2.4.4</elasticsearch.version>
-		<gemfire.version>8.2.3</gemfire.version>
+		<gemfire.version>8.2.4</gemfire.version>
 		<glassfish-el.version>3.0.0</glassfish-el.version>
 		<gradle.version>2.9</gradle.version>
 		<groovy.version>2.4.10</groovy.version>