chore: librarian release pull request: 20260331T115804Z (#16485)

PR created by the Librarian CLI to initialize a release. Merging this PR
will auto trigger a release.

Librarian Version: v1.0.2-0.20260309131826-42ac5c451239
Language Image:
us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:234b9d1f2ddb057ed7ac6a38db0bf8163d839c65c6cf88ade52530cddebce59e
<details><summary>google-cloud-documentai-toolbox: v0.15.2</summary>

##
[v0.15.2](google-cloud-documentai-toolbox-v0.15.1-alpha.1...google-cloud-documentai-toolbox-v0.15.2)
(2026-03-31)

### Chore

* Bump version to 0.15.2 without any other code changes


</details>

Author: parthea

.librarian/state.yaml

@@ -1692,7 +1692,7 @@ libraries:
       - packages/google-cloud-documentai/
     tag_format: '{id}-v{version}'
   - id: google-cloud-documentai-toolbox
-    version: 0.15.1-alpha.1
+    version: 0.15.2
     last_generated_commit: ""
     apis: []
     source_roots:

packages/google-cloud-documentai-toolbox/google/cloud/documentai_toolbox/version.py

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.15.1-alpha.1"
+__version__ = "0.15.2"