Add dependency management for new spring-session-data-gemfire module

Closes gh-5161

spring-boot-dependencies/pom.xml

@@ -1915,6 +1915,11 @@
 				<artifactId>spring-session</artifactId>
 				<version>${spring-session.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>org.springframework.session</groupId>
+				<artifactId>spring-session-data-gemfire</artifactId>
+				<version>${spring-session.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.springframework.session</groupId>
 				<artifactId>spring-session-data-redis</artifactId>