Fix Checkstyle suppressions DTD link.
diff --git a/conf/checkstyle-suppressions.xml b/conf/checkstyle-suppressions.xml
index 3b81f36..5954b25 100644
--- a/conf/checkstyle-suppressions.xml
+++ b/conf/checkstyle-suppressions.xml
@@ -1,7 +1,7 @@
<?xml version="1.0"?>
<!DOCTYPE suppressions PUBLIC
- "-//Puppy Crawl//DTD Suppressions 1.0//EN"
+ "-//Checkstyle//DTD SuppressionFilter Configuration 1.0//EN"
"https://checkstyle.org/dtds/suppressions_1_0.dtd">
<!--
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