fix protobuff dependency discrepency between java and java-util

Author: hboutemy

pom.xml

@@ -75,6 +75,12 @@ under the License.
       <artifactId>sigstore-java</artifactId>
       <version>0.4.0</version>
     </dependency>
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java</artifactId>
+      <version>3.22.0</version>
+      <scope>runtime</scope>
+    </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>