deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.61.0 (#1523)

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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) | `6.60.1` -> `6.61.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.61.0?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/6.61.0?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/6.60.1/6.61.0?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/6.60.1/6.61.0?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>

### [`v6.61.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6610-2024-03-04)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.60.1...v6.61.0)

##### Features

-   Support float32 type ([#&#8203;2894](https://togithub.com/googleapis/java-spanner/issues/2894)) ([19b7976](https://togithub.com/googleapis/java-spanner/commit/19b79764294e938ad85d02b7c0662db6ec3afeda))

##### Bug Fixes

-   Flaky test issue due to AbortedException. ([#&#8203;2925](https://togithub.com/googleapis/java-spanner/issues/2925)) ([cd34c1d](https://togithub.com/googleapis/java-spanner/commit/cd34c1d3ae9a5a36f4d5516dcf7c3667a9cf015a))

##### Dependencies

-   Update dependency com.google.cloud:sdk-platform-java-config to v3.27.0 ([#&#8203;2935](https://togithub.com/googleapis/java-spanner/issues/2935)) ([f8f835a](https://togithub.com/googleapis/java-spanner/commit/f8f835a9da705605c492e232a58276c39d1d7e6c))
-   Update dependency org.json:json to v20240303 ([#&#8203;2936](https://togithub.com/googleapis/java-spanner/issues/2936)) ([1d7044e](https://togithub.com/googleapis/java-spanner/commit/1d7044e97d16f5296b7de020cd24b11cbe2a7df0))

##### Documentation

-   Samples and tests for backup Admin APIs and overall spanner Admin APIs. ([#&#8203;2882](https://togithub.com/googleapis/java-spanner/issues/2882)) ([de13636](https://togithub.com/googleapis/java-spanner/commit/de1363645e03f46deed5be41f90ddfed72766751))
-   Update all public documents to use auto-generated admin clients. ([#&#8203;2928](https://togithub.com/googleapis/java-spanner/issues/2928)) ([ccb110a](https://togithub.com/googleapis/java-spanner/commit/ccb110ad6835557870933c95cfd76580fd317a16))

</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>6.60.1</version>
+        <version>6.61.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

src/test/java/com/google/cloud/spanner/jdbc/PartitionedQueryMockServerTest.java

@@ -158,7 +158,7 @@ public void testPartitionedQueryUsingSql() throws SQLException {
         partitionStatement.setBoolean(1, true);
         try (ResultSet results = partitionStatement.executeQuery()) {
           assertNotNull(results.getMetaData());
-          assertEquals(22, results.getMetaData().getColumnCount());
+          assertEquals(24, results.getMetaData().getColumnCount());
           int rowCount = 0;
           while (results.next()) {
             rowCount++;
@@ -376,7 +376,7 @@ public void testAutoPartitionMode() throws SQLException {
       try (ResultSet results =
           connection.createStatement().executeQuery("select * from my_table where active=true")) {
         assertNotNull(results.getMetaData());
-        assertEquals(22, results.getMetaData().getColumnCount());
+        assertEquals(24, results.getMetaData().getColumnCount());
         int rowCount = 0;
         while (results.next()) {
           rowCount++;
@@ -482,7 +482,7 @@ public void testAutoPartitionModeEmptyResult() throws SQLException {
       try (ResultSet results =
           connection.createStatement().executeQuery("select * from my_table where active=true")) {
         assertNotNull(results.getMetaData());
-        assertEquals(22, results.getMetaData().getColumnCount());
+        assertEquals(24, results.getMetaData().getColumnCount());
         int rowCount = 0;
         while (results.next()) {
           rowCount++;