fix(deps): update gapic-generator-java-bom.version to v2.66.0 (#4301)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[com.google.api:gapic-generator-java](https://redirect.github.com/googleapis/sdk-platform-java)
| `2.65.1` → `2.66.0` |
![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.api:gapic-generator-java/2.66.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.api:gapic-generator-java/2.65.1/2.66.0?slim=true)
|
|
[com.google.api:gapic-generator-java-bom](https://redirect.github.com/googleapis/sdk-platform-java)
| `2.65.1` → `2.66.0` |
![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.api:gapic-generator-java-bom/2.66.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.api:gapic-generator-java-bom/2.65.1/2.66.0?slim=true)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>googleapis/sdk-platform-java
(com.google.api:gapic-generator-java)</summary>

###
[`v2.66.0`](https://redirect.github.com/googleapis/sdk-platform-java/blob/HEAD/CHANGELOG.md#2660-2026-01-23)

[Compare
Source](https://redirect.github.com/googleapis/sdk-platform-java/compare/v2.65.1...v2.66.0)

##### Features

- Upgrade protobuf runtime and gen code to 4.33.x
([#&#8203;4000](https://redirect.github.com/googleapis/sdk-platform-java/issues/4000))
([#&#8203;4074](https://redirect.github.com/googleapis/sdk-platform-java/issues/4074))
([3e37376](https://redirect.github.com/googleapis/sdk-platform-java/commit/3e37376ccaddf42617436471dc9b014974b8e3df))

##### Dependencies

- Downgrade opentelemetry to 1.51.0
([#&#8203;4075](https://redirect.github.com/googleapis/sdk-platform-java/issues/4075))
([cf65482](https://redirect.github.com/googleapis/sdk-platform-java/commit/cf6548232830e0461500d92954050186e255b572))
- update auth library to 1.42.0
([#&#8203;4087](https://redirect.github.com/googleapis/sdk-platform-java/issues/4087))
([ad9ee07](https://redirect.github.com/googleapis/sdk-platform-java/commit/ad9ee0731a64585ad8ee0f0ac71bece9f6eaf068))
- update googleapis/java-cloud-bom digest to
[`ef3656d`](https://redirect.github.com/googleapis/sdk-platform-java/commit/ef3656d)
([#&#8203;3630](https://redirect.github.com/googleapis/sdk-platform-java/issues/3630))
([790bcf0](https://redirect.github.com/googleapis/sdk-platform-java/commit/790bcf0542dc8aba5afe2f65e80a74d643b40cfe))
- update http-client to 2.1.0
([#&#8203;4086](https://redirect.github.com/googleapis/sdk-platform-java/issues/4086))
([d8bc8f5](https://redirect.github.com/googleapis/sdk-platform-java/commit/d8bc8f5d335ffde52a603b47718574858f04f5ee))

</details>

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Author: renovate-bot

spring-cloud-generator/pom.xml

@@ -15,7 +15,7 @@
     <description>Spring Code Generator for Google Cloud</description>
 
     <properties>
-        <gapic-generator-java-bom.version>2.65.1</gapic-generator-java-bom.version>
+        <gapic-generator-java-bom.version>2.66.0</gapic-generator-java-bom.version>
         <!-- [gapic-test]: protobuf.version for compiling protos used in unit testing
              this should be consistent with version in gapic-generator-java-bom -->
         <protobuf.version>3.25.8</protobuf.version>