Updated spotbugs to 4.9.4

Author: andy-miles

pom.xml

@@ -111,7 +111,7 @@
     <properties>
         <maven.compiler.release>11</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <spotbugs.version>4.9.3</spotbugs.version>
+        <spotbugs.version>4.9.4</spotbugs.version>
         <spotbugs.maven.plugin.version>4.9.3.2</spotbugs.maven.plugin.version>
         <jacoco.plugin.version>0.8.13</jacoco.plugin.version>
         <lombok.version>1.18.38</lombok.version>