fix(deps): update dependency com.google.api.grpc:proto-google-cloud-apigee-registry-v1 to v0.3.0 (googleapis#8261)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api.grpc:proto-google-cloud-apigee-registry-v1](https://togithub.com/googleapis/java-apigee-registry/proto-google-cloud-apigee-registry-v1) ([source](https://togithub.com/googleapis/java-apigee-registry)) | `0.2.3-SNAPSHOT` -> `0.3.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-apigee-registry-v1/0.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-apigee-registry-v1/0.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-apigee-registry-v1/0.3.0/compatibility-slim/0.2.3-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-apigee-registry-v1/0.3.0/confidence-slim/0.2.3-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) |

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java-apigee-registry/google-cloud-apigee-registry-bom/pom.xml

@@ -76,7 +76,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-apigee-registry-v1</artifactId>
-        <version>0.2.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-apigee-registry-v1:current} -->
+        <version>0.3.0</version><!-- {x-version-update:proto-google-cloud-apigee-registry-v1:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>

java-apigee-registry/pom.xml

@@ -79,7 +79,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-apigee-registry-v1</artifactId>
-        <version>0.2.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-apigee-registry-v1:current} -->
+        <version>0.3.0</version><!-- {x-version-update:proto-google-cloud-apigee-registry-v1:current} -->
       </dependency>
 
       <dependency>