Update dependency com.github.spotbugs:spotbugs to v4.9.4

Author: renovate[bot]

pom.xml

@@ -263,7 +263,7 @@
           <dependency>
             <groupId>com.github.spotbugs</groupId>
             <artifactId>spotbugs</artifactId>
-            <version>4.9.3</version>
+            <version>4.9.4</version>
           </dependency>
         </dependencies>
       </plugin>