chore: regenerate discoveryengine client (googleapis#27370)

Generated in GitHub action: https://togithub.com/googleapis/googleapis/google-api-java-client-services/actions/workflows/codegen.yaml

Author: yoshi-code-bot

clients/google-api-services-discoveryengine/v1/2.0.0/pom.xml

@@ -147,7 +147,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.6</version>
+            <version>3.2.7</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>

clients/google-api-services-discoveryengine/v1alpha/2.0.0/pom.xml

@@ -147,7 +147,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.6</version>
+            <version>3.2.7</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>

clients/google-api-services-discoveryengine/v1beta/2.0.0/pom.xml

@@ -147,7 +147,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.6</version>
+            <version>3.2.7</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>