Update dependency com.github.spotbugs:spotbugs to v4.9.1

Author: renovate[bot]

pom.xml

@@ -346,7 +346,7 @@
             <dependency>
               <groupId>com.github.spotbugs</groupId>
               <artifactId>spotbugs</artifactId>
-              <version>4.8.6</version>
+              <version>4.9.1</version>
             </dependency>
           </dependencies>
         </plugin>