Upgrade spotbugs-maven-plugin to 3.1.2

Change-Id: I01d8392ef8d20efd7f03590c82da017e2b53a043
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -216,7 +216,7 @@
     <maven-javadoc-plugin-version>3.0.0</maven-javadoc-plugin-version>
     <tycho-extras-version>1.1.0</tycho-extras-version>
     <gson-version>2.8.2</gson-version>
-    <spotbugs-maven-plugin-version>3.1.1</spotbugs-maven-plugin-version>
+    <spotbugs-maven-plugin-version>3.1.2</spotbugs-maven-plugin-version>
     <maven-surefire-report-plugin-version>2.20.1</maven-surefire-report-plugin-version>
 
     <!-- Properties to enable jacoco code coverage analysis -->