deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.19.0 (#3704)
deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.19.0 (#3704)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-bom](https://togithub.com/googleapis/java-spanner) | `6.18.0` -> `6.19.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.19.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.19.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.19.0/compatibility-slim/6.18.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.19.0/confidence-slim/6.18.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/java-spanner</summary>

### [`v6.19.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6190-httpsgithubcomgoogleapisjava-spannercomparev6180v6190-2022-02-16)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.18.0...v6.19.0)

##### Features

-   automatically detect database dialect ([#&#8203;1677](https://togithub.com/googleapis/java-spanner/issues/1677)) ([9eccfc4](https://togithub.com/googleapis/java-spanner/commit/9eccfc441237272b01140c1f3d7da51b2b985554))
-   PostgreSQL dialect databases ([#&#8203;1673](https://togithub.com/googleapis/java-spanner/issues/1673)) ([5f156f2](https://togithub.com/googleapis/java-spanner/commit/5f156f2efdb4726679766b385d500a030c24e477))

##### Bug Fixes

-   allow getting metadata without calling next() ([#&#8203;1691](https://togithub.com/googleapis/java-spanner/issues/1691)) ([4cfe74e](https://togithub.com/googleapis/java-spanner/commit/4cfe74ef780f57747ea1dfef1a7098f809bcb300))
-   do not delete session in close method for BatchReadOnlyTransactionImpl ([#&#8203;1688](https://togithub.com/googleapis/java-spanner/issues/1688)) ([5dc3e19](https://togithub.com/googleapis/java-spanner/commit/5dc3e191bee603a7feec29b7d4412646d53d73e4))
-   untyped null parameters would cause NPE ([#&#8203;1680](https://togithub.com/googleapis/java-spanner/issues/1680)) ([7095f94](https://togithub.com/googleapis/java-spanner/commit/7095f940638d786745ed6715cf7a221d3e4a41a9)), closes [#&#8203;1679](https://togithub.com/googleapis/java-spanner/issues/1679)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-monitoring to v3.2.2 ([#&#8203;1666](https://togithub.com/googleapis/java-spanner/issues/1666)) ([8ea2220](https://togithub.com/googleapis/java-spanner/commit/8ea22205ea1361012b8f237af9150f320b41cc23))
-   update dependency com.google.cloud:google-cloud-trace to v2.1.2 ([#&#8203;1664](https://togithub.com/googleapis/java-spanner/issues/1664)) ([4f46635](https://togithub.com/googleapis/java-spanner/commit/4f46635577f0e754ce271e4aba338b84d34f57dd))

</details>

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