replace Findbugs with Spotbugs

fixes #3331

Author: Vladimir Kotal

pom.xml

@@ -386,9 +386,9 @@ Portions Copyright (c) 2018, 2020, Chris Fraire <[email protected]>.
     <reporting>
         <plugins>
             <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>findbugs-maven-plugin</artifactId>
-                <version>3.0.4</version>
+                <groupId>com.github.spotbugs</groupId>
+                <artifactId>spotbugs-maven-plugin</artifactId>
+                <version>4.1.3</version>
                 <configuration>
                     <xmlOutput>true</xmlOutput>
                     <includeFilterFile>dev/findbugs_filter.xml</includeFilterFile>