deps: update dependency org.springframework.cloud:spring-cloud-gcp-dependencies to v1.2.8.release (#497)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.springframework.cloud:spring-cloud-gcp-dependencies](https://projects.spring.io/spring-cloud/spring-cloud-gcp-dependencies/) ([source](https://togithub.com/spring-cloud/spring-cloud-build)) | `1.2.7.RELEASE` -> `1.2.8.RELEASE` | [![age](https://badges.renovateapi.com/packages/maven/org.springframework.cloud:spring-cloud-gcp-dependencies/1.2.8.RELEASE/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.springframework.cloud:spring-cloud-gcp-dependencies/1.2.8.RELEASE/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.springframework.cloud:spring-cloud-gcp-dependencies/1.2.8.RELEASE/compatibility-slim/1.2.7.RELEASE)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.springframework.cloud:spring-cloud-gcp-dependencies/1.2.8.RELEASE/confidence-slim/1.2.7.RELEASE)](https://docs.renovatebot.com/merge-confidence/) |

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samples/spring-framework/pom.xml

@@ -42,7 +42,7 @@ limitations under the License.
       <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-gcp-dependencies</artifactId>
-        <version>1.2.7.RELEASE</version>
+        <version>1.2.8.RELEASE</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>