Upgrade spotbugs to 4.0.4

Change-Id: I774e625efe486383c66a034091da16500677466a
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -172,7 +172,7 @@
     <tycho-extras-version>1.7.0</tycho-extras-version>
     <gson-version>2.8.2</gson-version>
     <bouncycastle-version>1.65</bouncycastle-version>
-    <spotbugs-maven-plugin-version>4.0.0</spotbugs-maven-plugin-version>
+    <spotbugs-maven-plugin-version>4.0.4</spotbugs-maven-plugin-version>
     <maven-project-info-reports-plugin-version>3.1.0</maven-project-info-reports-plugin-version>
     <maven-jxr-plugin-version>3.0.0</maven-jxr-plugin-version>
     <maven-surefire-plugin-version>3.0.0-M4</maven-surefire-plugin-version>