Fix Checkstyle XML.
<?xml version="1.0"?>
<!DOCTYPE suppressions PUBLIC
- -//Checkstyle//DTD SuppressionFilter Configuration 1.0//EN
+ "-//Checkstyle//DTD SuppressionFilter Configuration 1.0//EN"
"https://checkstyle.org/dtds/suppressions_1_0.dtd">
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
