deps: update dependency com.google.cloud:google-cloud-spanner-bom to …

…v6.55.0 (#6305)

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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) | `6.53.0` -> `6.55.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.55.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-spanner-bom/6.55.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-spanner-bom/6.53.0/6.55.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-spanner-bom/6.53.0/6.55.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-spanner (com.google.cloud:google-cloud-spanner-bom)</summary>

### [`v6.55.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6550-2023-12-01)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.54.0...v6.55.0)

##### Features

-   Add java sample for managed autoscaler ([#&#8203;2709](https://togithub.com/googleapis/java-spanner/issues/2709)) ([9ea4f4f](https://togithub.com/googleapis/java-spanner/commit/9ea4f4fe2925410b3defb4e53f3f0a328cc2e738))

##### Bug Fixes

-   **deps:** Update the Java code generator (gapic-generator-java) to 2.30.0 ([#&#8203;2703](https://togithub.com/googleapis/java-spanner/issues/2703)) ([961aa78](https://togithub.com/googleapis/java-spanner/commit/961aa7894be41ff87f1b460aa374ee2ed75a163b))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.20.0 ([#&#8203;2746](https://togithub.com/googleapis/java-spanner/issues/2746)) ([12bcabb](https://togithub.com/googleapis/java-spanner/commit/12bcabbf1ef82b19524400ebe280d9986bf70ea7))
-   Update dependency commons-io:commons-io to v2.15.1 ([#&#8203;2745](https://togithub.com/googleapis/java-spanner/issues/2745)) ([b9d9571](https://togithub.com/googleapis/java-spanner/commit/b9d9571dcc2d1d004cd785d79e45754c0ce63a51))

### [`v6.54.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6540-2023-11-15)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.53.0...v6.54.0)

##### Features

-   Enable session leaks prevention by cleaning up long-running tra… ([#&#8203;2655](https://togithub.com/googleapis/java-spanner/issues/2655)) ([faa7e5d](https://togithub.com/googleapis/java-spanner/commit/faa7e5dff17897b0432bc505b7ed24c33805f418))

##### Bug Fixes

-   Copy backup issue when backup is done across different instance IDs ([#&#8203;2732](https://togithub.com/googleapis/java-spanner/issues/2732)) ([7f6b158](https://togithub.com/googleapis/java-spanner/commit/7f6b1582770d2270efc9501136afb17a2677eaeb))
-   Respect SPANNER_EMULATOR_HOST env var when autoConfigEmulator=true ([#&#8203;2730](https://togithub.com/googleapis/java-spanner/issues/2730)) ([9c19934](https://togithub.com/googleapis/java-spanner/commit/9c19934a6170232f6ac2478ef9bfcdb2914d2562))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-trace to v2.30.0 ([#&#8203;2725](https://togithub.com/googleapis/java-spanner/issues/2725)) ([8618042](https://togithub.com/googleapis/java-spanner/commit/8618042bb716d8a6626bacee59f9e6c6f0d50362))

</details>

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google-cloud-bom/pom.xml

@@ -238,7 +238,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.53.0</version>
+        <version>6.55.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>