Merge pull request #805 from rabbitmq/dependabot/maven/spotbugs.version-4.9.4

Bump spotbugs.version from 4.9.3 to 4.9.4

Author: michaelklishin

pom.xml

@@ -95,7 +95,7 @@
     <google-java-format.version>1.28.0</google-java-format.version>
     <jacoco.version>0.8.13</jacoco.version>
     <spotbugs-maven-plugin.version>4.9.3.2</spotbugs-maven-plugin.version>
-    <spotbugs.version>4.9.3</spotbugs.version>
+    <spotbugs.version>4.9.4</spotbugs.version>
     <!-- for documentation -->
     <broker.version>4.1</broker.version>
     <!-- to sign artifacts when releasing -->