upgrade checkstyle (#752)

diff --git a/pom.xml b/pom.xml
index 054af24..b2d83db 100644
--- a/pom.xml
+++ b/pom.xml
@@ -619,7 +619,7 @@
     <commons.encoding>utf-8</commons.encoding>
 
     <checkstyle.plugin.version>3.1.2</checkstyle.plugin.version>
-    <checkstyle.version>8.41.1</checkstyle.version>
+    <checkstyle.version>8.42</checkstyle.version>
     <checkstyle.configdir>src/site/resources/checkstyle</checkstyle.configdir>
 
     <spotbugs.plugin.version>4.2.3</spotbugs.plugin.version>
diff --git a/src/site/resources/checkstyle/checkstyle.xml b/src/site/resources/checkstyle/checkstyle.xml
index afce193..ea572b9 100644
--- a/src/site/resources/checkstyle/checkstyle.xml
+++ b/src/site/resources/checkstyle/checkstyle.xml
@@ -45,7 +45,7 @@
     <module name="UnusedImports"/>
     <module name="NeedBraces"/>
     <module name="JavadocMethod">
-      <property name="scope" value="public" />
+      <property name="accessModifiers" value="public" />
     </module>
     <module name="ModifierOrder"/>
     <module name="RedundantModifier"/>