MINOR: Bump com.google.api.grpc:proto-google-common-protos from 2.74.0 to 2.78.0 (#1396)

Bumps
[com.google.api.grpc:proto-google-common-protos](https://github.com/googleapis/google-cloud-java)
from 2.74.0 to 2.78.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/googleapis/google-cloud-java/blob/main/java-document-ai/CHANGELOG.md">com.google.api.grpc:proto-google-common-protos's
changelog</a>.</em></p>
<blockquote>
<h2>2.78.0 (2025-09-11)</h2>
<h3>Dependencies</h3>
<ul>
<li>update dependency com.google.cloud:sdk-platform-java-config to
v3.52.1 (<a
href="https://redirect.github.com/googleapis/google-cloud-java/issues/11738">#11738</a>)
(<a
href="https://github.com/googleapis/google-cloud-java/commit/b17cf6de63b9cabcd44b6fc21b57c187b321ae8f">b17cf6d</a>)</li>
</ul>
<h2>2.77.0 (2025-08-25)</h2>
<h3>Dependencies</h3>
<ul>
<li>update dependency com.google.cloud:sdk-platform-java-config to
v3.52.0 (<a
href="https://redirect.github.com/googleapis/google-cloud-java/issues/11727">#11727</a>)
(<a
href="https://github.com/googleapis/google-cloud-java/commit/31d86980d0e27e0a948727d778cf46fbcf227239">31d8698</a>)</li>
</ul>
<h2>2.76.0 (2025-08-13)</h2>
<ul>
<li>No change</li>
</ul>
<h2>2.75.0 (2025-08-08)</h2>
<h3>Dependencies</h3>
<ul>
<li>update dependency com.google.cloud:sdk-platform-java-config to
v3.51.0 (<a
href="https://redirect.github.com/googleapis/google-cloud-java/issues/11695">#11695</a>)
(<a
href="https://github.com/googleapis/google-cloud-java/commit/b82ce005c30551b8714099b7219b71bda85aa3a5">b82ce00</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/googleapis/google-cloud-java/commits/gapic-generator-java/v2.78.0">compare
view</a></li>
</ul>
</details>
<br />


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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>