fix(ci): fix maven-javadoc-plugin config

Author: welschsn

pom.xml

@@ -446,7 +446,6 @@
                   <goal>jar</goal>
                 </goals>
                 <configuration>
-                  <source>8</source>
                   <detectJavaApiLink>false</detectJavaApiLink>
                 </configuration>
               </execution>
@@ -457,7 +456,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>3.1.0</version>
+            <version>3.2.6</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>