…2.0 (#753)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:libraries-bom](https://togithub.com/GoogleCloudPlatform/cloud-opensource-java) | minor | `16.1.0` -> `16.2.0` |

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Corresponding google-cloud-go PR: googleapis/google-cloud-go#5457

Changes:

feat(pubsub): add exactly once delivery flag
  PiperOrigin-RevId: 426415626
  Source-Link: googleapis/googleapis@1f707ab

feat(pubsub): add exactly once delivery flag
  PiperOrigin-RevId: 426401315
  Source-Link: googleapis/googleapis@f02f439

chore(bazel): update gapic-generator-php v1.4.3
  Changes include:
  - backwards-compat field_behavior patches for Firestore

  PiperOrigin-RevId: 426390959
  Source-Link: googleapis/googleapis@5d7f6a2

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## [2.6.0](googleapis/java-spanner-jdbc@v2.5.11...v2.6.0) (2022-02-24)


### Features

* add support for PostgreSQL dialect ([googleapis#739](googleapis/java-spanner-jdbc#739)) ([f9daa19](googleapis/java-spanner-jdbc@f9daa19))


### Bug Fixes

* create specific metadata queries for PG ([googleapis#759](googleapis/java-spanner-jdbc#759)) ([caffda0](googleapis/java-spanner-jdbc@caffda0))


### Dependencies

* update dependency com.google.cloud:google-cloud-spanner-bom to v6.20.0 ([googleapis#758](googleapis/java-spanner-jdbc#758)) ([311d1ca](googleapis/java-spanner-jdbc@311d1ca))

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