JCR-4678: Update tomcat dependency to 8.5.64

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1887422 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/jackrabbit-webapp/pom.xml b/jackrabbit-webapp/pom.xml
index 0bb4162..5790b9b 100644
--- a/jackrabbit-webapp/pom.xml
+++ b/jackrabbit-webapp/pom.xml
@@ -35,7 +35,7 @@
   <description>Web application that hosts and serves a Jackrabbit content repository</description>
 
   <properties>
-    <tomcat.version>8.5.63</tomcat.version>
+    <tomcat.version>8.5.64</tomcat.version>
   </properties>
 
   <dependencies>