Update Checkstyle DTD version from 1.0 to 1.2
diff --git a/commons-digester3-core/checkstyle-suppressions.xml b/commons-digester3-core/checkstyle-suppressions.xml
index 1464f47..9661b07 100644
--- a/commons-digester3-core/checkstyle-suppressions.xml
+++ b/commons-digester3-core/checkstyle-suppressions.xml
@@ -1,7 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE suppressions PUBLIC
-     "-//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
    contributor license agreements.  See the NOTICE file distributed with
@@ -18,6 +15,9 @@
    See the License for the specific language governing permissions and
    limitations under the License.
 -->
+<!DOCTYPE suppressions PUBLIC
+    "-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
+    "https://checkstyle.org/dtds/suppressions_1_2.dtd">
 <suppressions>
   <suppress checks="RegexpHeader" files="package-info.java" lines="0-9999" />
   <suppress checks="HiddenField" files=".+\.java" lines="0-9999" />