Remove Spring Session GemFire dependency

Remove Spring Session GemFire dependency since it is
no longer supported in Spring Session 2.0.

Closes gh-9011

spring-boot-dependencies/pom.xml

@@ -2241,11 +2241,6 @@
 					</exclusion>
 				</exclusions>
 			</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-hazelcast</artifactId>