GEODE-10099: Bump version to 1.12.9

As part of the Geode Release Process, the geode-examples build number
must be rolled forward as work begins on the next release
diff --git a/gradle.properties b/gradle.properties
index 1b18398..0d46a10 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 version = 1.12.9-build.0
-geodeVersion = 1.12.+
+geodeVersion = 1.12.9
 
 # release properties, set these on the command line to validate against
 # a release candidate