Drop no longer used XSDs

Author: pzygielo

mq/.jakartaee-catalog.xml

@@ -16,6 +16,5 @@
 
 -->
 <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
-    <system systemId="https://jakarta.ee/xml/ns/jakartaee/connector_2_0.xsd" uri=".schemas/connector_2_0.xsd"/>
     <system systemId="https://jakarta.ee/xml/ns/jakartaee/connector_2_1.xsd" uri=".schemas/connector_2_1.xsd"/>
 </catalog>