Upgrade to GemFire 8.2.12

Closes gh-14739

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -76,7 +76,7 @@
 		<flyway.version>3.2.1</flyway.version>
 		<freemarker.version>2.3.28</freemarker.version>
 		<elasticsearch.version>2.4.6</elasticsearch.version>
-		<gemfire.version>8.2.11</gemfire.version>
+		<gemfire.version>8.2.12</gemfire.version>
 		<glassfish-el.version>3.0.0</glassfish-el.version>
 		<gradle.version>2.9</gradle.version>
 		<groovy.version>2.4.15</groovy.version>