Fix Checkstyle suppressions DTD link.

garydgregory · garydgregory · commit db6b786abf15 · 2021-01-11T12:00:01.000-05:00
diff --git a/checkstyle-suppressions.xml b/checkstyle-suppressions.xml
@@ -19,7 +19,7 @@ limitations under the License.
 
 <!DOCTYPE suppressions PUBLIC
     "-//Puppy Crawl//DTD Suppressions 1.0//EN"
-    "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
+    "https://checkstyle.org/dtds/suppressions_1_0.dtd">
 
 <suppressions>
     <suppress checks="Header" files="LICENSE.txt"/>
