Adopt JDK 11 as a build target
diff --git a/pom.xml b/pom.xml
index 253a6ef..7340ed7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -68,7 +68,7 @@
     <properties>
         <james-skin.version>1.8</james-skin.version>
 
-        <target.jdk>1.8</target.jdk>
+        <target.jdk>1.11</target.jdk>
         <commons-logging.version>1.3.5</commons-logging.version>
         <log4j.version>2.25.0</log4j.version>
         <junit.version>4.13.2</junit.version>