Upgrade maven-shade-plugin to 3.2.1

Change-Id: I4f194008bb02ab58eba6d44d1be0424c47be4d81
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

diff --git a/pom.xml b/pom.xml
index d7daae9..610a9a3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -278,7 +278,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-shade-plugin</artifactId>
-          <version>3.2.0</version>
+          <version>3.2.1</version>
         </plugin>
 
         <plugin>