deps: update dependency com.google.cloud:google-cloud-bigtable-bom to v2.20.0 (#5852)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigtable-bom](https://togithub.com/googleapis/java-bigtable) | `2.19.2` -> `2.20.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/2.20.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/2.20.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/2.20.0/compatibility-slim/2.19.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/2.20.0/confidence-slim/2.19.2)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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### Release Notes

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

### [`v2.20.0`](https://togithub.com/googleapis/java-bigtable/blob/HEAD/CHANGELOG.md#&#8203;2200-httpsgithubcomgoogleapisjava-bigtablecomparev2192v2200-2023-03-02)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v2.19.2...v2.20.0)

##### Features

-   Add getNewPartitions method to CloseStream for Bigtable ChangeStream ([#&#8203;1655](https://togithub.com/googleapis/java-bigtable/issues/1655)) ([8847fed](https://togithub.com/googleapis/java-bigtable/commit/8847fed7f77ce4715c197ca1cfcc3108e0fa1004))
-   Add new_partitions field for CloseStream for Cloud Bigtable ChangeStream ([#&#8203;1654](https://togithub.com/googleapis/java-bigtable/issues/1654)) ([0e283bf](https://togithub.com/googleapis/java-bigtable/commit/0e283bff0a12f5e4da8b0975d4bd747229c3780c))

##### Bug Fixes

-   Fix StackOverflow in ChangeStreamStateMachine due to excessive mods ([#&#8203;1648](https://togithub.com/googleapis/java-bigtable/issues/1648)) ([9e11106](https://togithub.com/googleapis/java-bigtable/commit/9e1110600dc64defcd9143753f45b5b8226aa339))
-   Use org.threeten.bp.Duration for ReadChangeStreamQuery::heartbeatDura… ([#&#8203;1652](https://togithub.com/googleapis/java-bigtable/issues/1652)) ([87261a9](https://togithub.com/googleapis/java-bigtable/commit/87261a977d6fc7877d7d253c67ea34c264f63f7c))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-monitoring-bom to v3.13.0 ([#&#8203;1656](https://togithub.com/googleapis/java-bigtable/issues/1656)) ([1c632ec](https://togithub.com/googleapis/java-bigtable/commit/1c632ec63987958e469e2b5861c29724c5cb8970))
-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.4.0 ([#&#8203;1657](https://togithub.com/googleapis/java-bigtable/issues/1657)) ([c7a3e29](https://togithub.com/googleapis/java-bigtable/commit/c7a3e29dc717e2fa3d9b15f1ae9fb9f795d6f78a))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -186,7 +186,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigtable-bom</artifactId>
-        <version>2.19.2</version>
+        <version>2.20.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>