Revert "Update to Checkstyle 8.12"
am: 105304c046

Change-Id: I1bb162a5e6fde06a6bfc9d1c33a3671a9acf6e42
diff --git a/checkstyle.jar b/checkstyle.jar
index fad7528..747b3e3 100644
--- a/checkstyle.jar
+++ b/checkstyle.jar
Binary files differ
diff --git a/default-treewalker-checks.xml b/default-treewalker-checks.xml
index 33eca0e..7e09891 100644
--- a/default-treewalker-checks.xml
+++ b/default-treewalker-checks.xml
@@ -210,6 +210,7 @@
 <module name="OuterTypeFilename">
   <property name="severity" value="error"/>
 </module>
+<module name="FileContentsHolder"/>
 <module name="SuppressionCommentFilter">
   <property name="offCommentFormat" value="CHECKSTYLE:OFF IndentationCheck"/>
   <property name="onCommentFormat" value="CHECKSTYLE:ON IndentationCheck"/>