Update versions of spotbugs-maven-plugin and maven-pmd-plugin.

Author: kwwall

pom.xml

@@ -135,7 +135,7 @@
         <version.fluido>2.0.0-M11</version.fluido>  <!-- Version 2.1.0 is available, but fails with this min Maven. -->
         <version.powermock>2.0.9</version.powermock>
         <version.spotbugs>4.9.3</version.spotbugs>
-        <version.spotbugs.maven>4.9.3.0</version.spotbugs.maven>
+        <version.spotbugs.maven>4.9.3.1</version.spotbugs.maven>
         <version.surefire>3.5.3</version.surefire>
         <project.java.target>1.8</project.java.target>
             <!-- TODO: Be sure to update. Should be date of previous official release -->
@@ -664,7 +664,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.26.0</version>
+                <version>3.27.0</version>
             </plugin>
 
             <plugin>