fix: pin async javadocs to Java 11 (#318)

The Java publish workflow for `v0.5.3` failed while generating Javadocs
for the async modules because they use `java.net.http`, but the
inherited Javadoc configuration was still resolved against Java 8
semantics. This change pins the async modules' Javadoc generation to
Java 11 locally, without changing the root profile used by the
synchronous modules.

I validated this by rerunning the async Maven packaging path with
`deploy-to-ossrh`; the original `package java.net.http does not exist`
failure no longer reproduces and the build now advances to an unrelated
external Javadoc link fetch error.

Author: Xuanwo

java/async-client-pom.xml

@@ -105,6 +105,14 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.2.5</version>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <configuration>
+                    <source>11</source>
+                    <release>11</release>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

java/lance-namespace-async-client/pom.xml

@@ -105,6 +105,14 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.2.5</version>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <configuration>
+                    <source>11</source>
+                    <release>11</release>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

java/lance-namespace-core-async/pom.xml

@@ -67,6 +67,14 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.2.5</version>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <configuration>
+                    <source>11</source>
+                    <release>11</release>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 </project>