🤖 I have created a release *beep* *boop*
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### Updating meta-information for bleeding-edge SNAPSHOT release.

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This PR was generated with [Release Please](https://togithub.com/googleapis/release-please). See [documentation](https://togithub.com/googleapis/release-please#release-please).

…versions (#4284)

* chore: use graal-sdk-nativeimage.version to manage graal-sdk versions

* chore: generate libraries at Thu Jan  1 23:39:12 UTC 2026

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Co-authored-by: cloud-java-bot <cloud-java-bot@google.com>

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The `SHOW DEFAULT_TRANSACTION_ISOLATION` command can be used in PostgreSQL to query
the current default isolation level for a connection. This command was not supported
by the Spanner JDBC driver and PGAdapter, which made it difficult for customers to
check whether their attempt to set a different default isolation level actually worked.

Updates GoogleCloudPlatform/pgadapter#3984

* fix: adjust the initial polling delay for ddl operations

* fix the lint issue

* refactor the code

* create a separate setting for updateDatabaseDdl

* chore: abstract plain text settings into a SpannerOption

* add unit test for plain text scenarios

* gemini suggested code changes

* updated javadoc

* missing space

* fixed unit test

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Co-authored-by: rahul2393 <irahul@google.com>

* fix(spanner): Retry creation of multiplexed session

* Reduce wait time to run tests faster

* chore(main): release 6.106.0

* chore: generate libraries at Wed Jan  7 15:11:02 UTC 2026

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Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: cloud-java-bot <cloud-java-bot@google.com>