GEODE-10089: Update examples version

Now that support/1.15 has been created,
pair develop examples with 1.16.0

Author: onichols-pivotal

gradle.properties

@@ -14,8 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-version = 1.15.0-build.0
-geodeVersion = 1.15.+
+version = 1.16.0-build.0
+geodeVersion = 1.16.+
 
 # release properties, set these on the command line to validate against
 # a release candidate