chore: generate libraries at Thu Mar 5 20:28:36 UTC 2026

Author: cloud-java-bot

README.md

@@ -381,6 +381,7 @@ Samples are in the [`samples/`](https://github.com/googleapis/java-spanner/tree/
 | List Databases Sample | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/ListDatabasesSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/ListDatabasesSample.java) |
 | List Instance Config Operations Sample | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigOperationsSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigOperationsSample.java) |
 | List Instance Configs Sample | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigsSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigsSample.java) |
+| Mutable Credentials Example | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/MutableCredentialsExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/MutableCredentialsExample.java) |
 | Pg Alter Sequence Sample | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/PgAlterSequenceSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/PgAlterSequenceSample.java) |
 | Pg Async Query To List Async Example | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/PgAsyncQueryToListAsyncExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/PgAsyncQueryToListAsyncExample.java) |
 | Pg Async Runner Example | [source code](https://github.com/googleapis/java-spanner/blob/main/samples/snippets/src/main/java/com/example/spanner/PgAsyncRunnerExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-spanner&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/PgAsyncRunnerExample.java) |