update spotbugs to version that support java21

Author: xsalefter

pom.xml

@@ -41,6 +41,10 @@
     <properties>
         <check.fail-spotbugs>true</check.fail-spotbugs>
         <check.spotbugs-exclude-filter-file>spotbugs-exclude.xml</check.spotbugs-exclude-filter-file>
+        <!-- killbill-oss-parent still brings SpotBugs 4.7.2.1, whose ASM stack cannot parse
+             Java 21 class files. Keep this local override until the parent moves to a
+             Java-21-capable SpotBugs line. -->
+        <spotbugs-maven-plugin.version>4.9.8.3</spotbugs-maven-plugin.version>
     </properties>
     <dependencies>
         <dependency>
@@ -56,4 +60,13 @@
             <artifactId>joda-time</artifactId>
         </dependency>
     </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>com.github.spotbugs</groupId>
+                <artifactId>spotbugs-maven-plugin</artifactId>
+                <version>${spotbugs-maven-plugin.version}</version>
+            </plugin>
+        </plugins>
+    </build>
 </project>