Upgrade to Spring Boot 2.6.12.

Author: jxblum

gradle.properties

@@ -2,7 +2,7 @@ org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8
 deployDocsHost=docs-ip.spring.io
 apacheGeodeVersion=1.14.4
 springVersion=5.3.23
-springBootVersion=2.6.6
+springBootVersion=2.6.12
 springDataBomVersion=2021.1.4
 springDataCommonsVersion=2.6.4
 springDataGeodeVersion=2.6.4