Upgrade maven-compiler-plugin to 3.8.1

Change-Id: If8f8706f59254e8c20f1f42f46daa3b02c54ace1

pom.xml

diff --git a/pom.xml b/pom.xml
index f2aa17a..9fdf2ce 100644
--- a/pom.xml
+++ b/pom.xml
@@ -381,7 +381,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.0</version>
+        <version>3.8.1</version>
         <configuration>
           <compilerId>javac-with-errorprone</compilerId>
           <forceJavacCompilerUse>true</forceJavacCompilerUse>