deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.60.0 (#1508)

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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) | `6.59.0` -> `6.60.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.60.0?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/6.60.0?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/6.59.0/6.60.0?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/6.59.0/6.60.0?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>

### [`v6.60.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6600-2024-02-21)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.59.0...v6.60.0)

##### Features

-   Add an API method for reordering firewall policies ([62319f0](https://togithub.com/googleapis/java-spanner/commit/62319f032163c4ad3e8771dd5f92e7b8a086b5ee))
-   **spanner:** Add field for multiplexed session in spanner.proto ([62319f0](https://togithub.com/googleapis/java-spanner/commit/62319f032163c4ad3e8771dd5f92e7b8a086b5ee))
-   Update TransactionOptions to include new option exclude_txn_from_change_streams ([#&#8203;2853](https://togithub.com/googleapis/java-spanner/issues/2853)) ([62319f0](https://togithub.com/googleapis/java-spanner/commit/62319f032163c4ad3e8771dd5f92e7b8a086b5ee))

##### Bug Fixes

-   Add ensureDecoded to proto type ([#&#8203;2897](https://togithub.com/googleapis/java-spanner/issues/2897)) ([e99b78c](https://togithub.com/googleapis/java-spanner/commit/e99b78c5d810195d368112eed2b185d2d99e62a9))
-   **spanner:** Fix write replace used by dataflow template and import export ([#&#8203;2901](https://togithub.com/googleapis/java-spanner/issues/2901)) ([64b9042](https://togithub.com/googleapis/java-spanner/commit/64b90429d4fe53f8509a3923e046406b4bc5876a))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-trace to v2.36.0 ([#&#8203;2749](https://togithub.com/googleapis/java-spanner/issues/2749)) ([51a348a](https://togithub.com/googleapis/java-spanner/commit/51a348a0c2b84106ea763721bed3420a0d07f30a))

##### Documentation

-   Update comments ([62319f0](https://togithub.com/googleapis/java-spanner/commit/62319f032163c4ad3e8771dd5f92e7b8a086b5ee))
-   Update the comment regarding eligible SQL shapes for PartitionQuery ([62319f0](https://togithub.com/googleapis/java-spanner/commit/62319f032163c4ad3e8771dd5f92e7b8a086b5ee))

</details>

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Author: renovate-bot

pom.xml

@@ -62,7 +62,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.59.0</version>
+        <version>6.60.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>