[fix] use local jetty configure DTDs

jetty configuration DTD was loaded from the internet even though it was listed in the catalog.
Added the public identifier and corrected the system identifier (which is now using https).

Author: line-o

exist-distribution/src/main/xslt/catalog.xml

@@ -22,8 +22,8 @@
 
 -->
 <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
-    <system systemId="http://www.eclipse.org/jetty/configure_9_3.dtd"
-            uri="configure_9_3.dtd"/>
-    <uri name="http://xmlns.jcp.org/xml/ns/javaee" uri="web-app_3_1.xsd"/>
-    <uri name="http://www.w3.org/XML/1998/namespace" uri="xml.xsd"/>
+    <public publicId="-//Jetty//Configure//EN" uri="./configure_9_3.dtd"/>
+    <system systemId="https://www.eclipse.org/jetty/configure_9_3.dtd" uri="./configure_9_3.dtd"/>
+    <uri name="http://xmlns.jcp.org/xml/ns/javaee" uri="./web-app_3_1.xsd"/>
+    <uri name="http://www.w3.org/XML/1998/namespace" uri="./xml.xsd"/>
 </catalog>