Upgrade to Spring Data for Apache Geode 2.6.6.

Author: jxblum

gradle.properties

@@ -11,7 +11,7 @@ springVersion=5.3.22
 springBootVersion=2.6.10
 springCloudBindingsVersion=1.8.1
 springDataBomVersion=2021.1.6
-springDataGeodeVersion=2.6.5
+springDataGeodeVersion=2.6.6
 springDataGeodeTestVersion=0.2.2-Q
 springSessionBomVersion=2021.1.3
 springSessionDataGeodeVersion=2.6.1