🤖 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).

* docs: remove reference to returning clauses for Batch DML

Remove the reference to THEN RETURN / RETURNING clauses for Batch DML
requests, as these clauses are ignored for batch DML and not returned to
the client.

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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…to v6.48.0 (#2643)

* chore(deps): update dependency com.google.cloud:google-cloud-spanner to v6.48.0

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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…cies to v3.16.1 (#2637)

* deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v3.16.1

* chore: fixes from `dependencies.sh`

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Diego Marquez <[email protected]>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

* docs: improve timeout and retry sample

The timeout and retry sample used 60 seconds for both initial,
max, and total timeout. It also used a 1.0 multiplier for the
timeout value. This made it impossible to explain how to set
an increasing RPC timeout value. It also rendered adding the
DEADLINE_EXCEEDED error code as a retryable code superfluous.

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* chore: update timeout values based on what is possible with other languages

* test: move sample test to separate class

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…acquisition. (#2641)

* feat: add session pool option for modelling a timeout around session acquisition.

* docs: modify existing documentation.

* Update google-cloud-spanner/src/main/java/com/google/cloud/spanner/SessionPoolOptions.java

Co-authored-by: Knut Olav Løite <[email protected]>

* Update google-cloud-spanner/src/main/java/com/google/cloud/spanner/SessionPoolOptions.java

Co-authored-by: Knut Olav Løite <[email protected]>

* chore: address review comments.

* fix: lint errors.

* fix: broken unit test.

* chore: add more unit test.

* fix: review comments.

* fix: NPE in unit test.

* Update google-cloud-spanner/src/main/java/com/google/cloud/spanner/SessionPoolOptions.java

Co-authored-by: Knut Olav Løite <[email protected]>

* chore: fix review comments.

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Knut Olav Løite <[email protected]>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

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