Fix #369: Ensure owasp-java-html-sanitizer targets Java 8

Fixes #369

Author: aalmiray

owasp-java-html-sanitizer/pom.xml

@@ -17,7 +17,7 @@
   </description>
 
   <properties>
-    <maven.compiler.release>10</maven.compiler.release>
+    <maven.compiler.release>8</maven.compiler.release>
   </properties>
 
   <build>