update librarian version for release version fix

Author: zhumin8

librarian.yaml

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 language: java
-version: v0.15.1-0.20260601155236-20ff0d932dcc
+version: v0.16.1-0.20260602193207-5917f20190fa
 repo: googleapis/google-cloud-java
 sources:
   googleapis: