Fix javadoc plugin failure for spring-ai-1.x-plugin with blank maven.compiler.release

Same pattern as jdk-http-plugin: javadoc plugin fails on empty
maven.compiler.release value, so set failOnError=false.

Author: wu-sheng

apm-sniffer/apm-sdk-plugin/spring-plugins/spring-ai-1.x-plugin/pom.xml

@@ -47,4 +47,16 @@
         </dependency>
 
     </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <configuration>
+                    <failOnError>false</failOnError>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 </project>