MINOR: Bump com.google.api.grpc:proto-google-common-protos

Bumps [com.google.api.grpc:proto-google-common-protos](https://github.com/googleapis/google-cloud-java) from 2.74.0 to 2.78.0.
- [Release notes](https://github.com/googleapis/google-cloud-java/releases)
- [Changelog](https://github.com/googleapis/google-cloud-java/blob/main/java-document-ai/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-cloud-java/commits/gapic-generator-java/v2.78.0)

---
updated-dependencies:
- dependency-name: com.google.api.grpc:proto-google-common-protos
  dependency-version: 2.78.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

flight/flight-core/pom.xml

@@ -133,7 +133,7 @@ under the License.
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-common-protos</artifactId>
-      <version>2.74.0</version>
+      <version>2.78.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>