Add $dynamicRef changes to change log

Author: jdesrosiers

jsonschema-core.xml

@@ -3858,6 +3858,7 @@ https://example.com/schemas/common#/$defs/count/minimum
                     <t hangText="draft-bhutton-json-schema-next">
                         <list style="symbols">
                             <t>"contains" now applies to objects as well as arrays</t>
+                            <t>Remove bookending requirement for "$dynamicRef"</t>
                         </list>
                     </t>
                     <t hangText="draft-bhutton-json-schema-00">