Workaround maven.restlet.org service cert expiry. (#1602)

This is pulling over workaround as reported in usnistgov/oscal-content#139 with the WIP workaround submodule.

usnistgov/oscal-content@26f0fe1

build/pom.xml

@@ -16,12 +16,17 @@
         the following errors:
         
         The following artifacts could not be resolved: org.restlet.jee:org.restlet:jar:2.2.2 ...
+
+        20221230 Workaround: TLS certificates for the restlet.org maven service
+        expired, see the following GitHub issue for details and status updates
+        about workaround alternative service and target or maven.restlet.org 
+        redirect. https://github.com/restlet/restlet-framework-java/issues/1390
     -->
     <repositories>
         <repository>
             <id>maven.restlet.org</id>
             <name>maven.restlet.org</name>
-            <url>https://maven.restlet.org</url>
+            <url>https://maven.restlet.talend.com</url>
         </repository>
     </repositories>