[Java] Upgrade to Agrona 1.0.8.

Author: mjpt777

build.gradle

@@ -128,7 +128,7 @@ subprojects {
     dependencies {
         checkstyle 'com.puppycrawl.tools:checkstyle:8.24'
 
-        compile 'org.agrona:agrona:1.0.7'
+        compile 'org.agrona:agrona:1.0.8'
 
         testCompile 'org.hamcrest:hamcrest:2.1'
         testCompile 'org.mockito:mockito-core:3.1.0'