deps: update dependency com.google.cloud:native-image-support to v0.12.8 (#1051)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:native-image-support](https://togithub.com/googleapis/java-core) | `0.12.7` -> `0.12.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:native-image-support/0.12.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:native-image-support/0.12.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:native-image-support/0.12.8/compatibility-slim/0.12.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:native-image-support/0.12.8/confidence-slim/0.12.7)](https://docs.renovatebot.com/merge-confidence/) |

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samples/native-image-sample/pom.xml

@@ -107,7 +107,7 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
         <dependency>
           <groupId>com.google.cloud</groupId>
           <artifactId>native-image-support</artifactId>
-          <version>0.12.7</version>
+          <version>0.12.8</version>
         </dependency>
         <dependency>
           <groupId>org.junit.vintage</groupId>