chore(deps): update dependency com.google.cloud:google-cloud-spanner …

…to v6.60.0 (#2917)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner](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/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/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/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/6.59.0/6.60.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

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

##### 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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README.md

@@ -42,7 +42,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-spanner</artifactId>
-  <version>6.59.0</version>
+  <version>6.60.0</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -33,7 +33,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
-      <version>6.59.0</version>
+      <version>6.60.0</version>
     </dependency>
     <!-- [END spanner_install_without_bom] -->