Fixes jetty#6354 - allow jetty bundles to use 1.7 slf4j

This updates the parent pom to set the range for all
imports of slf4j by the jetty bundles

Signed-off-by: Thomas Watson <tjwatson@us.ibm.com>

pom.xml

@@ -741,6 +741,10 @@
               <Bundle-Vendor>Eclipse Jetty Project</Bundle-Vendor>
               <Bundle-Classpath>.</Bundle-Classpath>
               <Bundle-Copyright>Copyright (c) 2008-2021 Mort Bay Consulting Pty Ltd and others.</Bundle-Copyright>
+              <Import-Package>
+                org.slf4j.*;version="[1.7,3.0)",
+                *
+              </Import-Package>
               <_provider-policy><![CDATA[$<range;[===,=+)>]]></_provider-policy>
               <_consumer-policy><![CDATA[$<range;[===,+)>]]></_consumer-policy>
               <_noee>true</_noee>