chore: pin maven-gpg-plugin version to 3.2.8.

Declare an explicit plugin version so Maven does not warn and resolve it from repository metadata.

Signed-off-by: Haotian Zhang <928016560@qq.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

pom.xml

@@ -107,6 +107,7 @@
 		<!-- Maven Plugin Versions -->
 		<jacoco.version>0.8.12</jacoco.version>
 		<maven-clean-plugin.version>3.4.0</maven-clean-plugin.version>
+		<maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
 		<central.publishing.maven.plugin.version>0.8.0</central.publishing.maven.plugin.version>
 
 		<!--  Checkstyle      -->
@@ -318,6 +319,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>
+						<version>${maven-gpg-plugin.version}</version>
 						<executions>
 							<execution>
 								<id>sign-artifacts</id>

spring-cloud-tencent-dependencies/pom.xml

@@ -81,6 +81,7 @@
 
 		<!-- Maven Plugin Versions -->
 		<flatten-maven-plugin.version>1.6.0</flatten-maven-plugin.version>
+		<maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
 		<central.publishing.maven.plugin.version>0.8.0</central.publishing.maven.plugin.version>
 	</properties>
 
@@ -345,6 +346,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>
+						<version>${maven-gpg-plugin.version}</version>
 						<executions>
 							<execution>
 								<phase>verify</phase>