GEODE-10401: Bump version to 1.15.2

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 c00a9cb..a787eb7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,8 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-version = 1.15.1-build.0
-geodeVersion = 1.15.1
+version = 1.15.2-build.0
+geodeVersion = 1.15.+
 
 # release properties, set these on the command line to validate against
 # a release candidate