increase "universe" in variablemetadata table from varchar 255 to text

doc/release-notes/9728-universe-variablemetadata.md

@@ -0,0 +1 @@
+universe field in variablemetadata table was changed from varchar(255) to text. The change was made to support longer strings in "universe" metadata field, similar to the rest of text fields in variablemetadata table.

src/main/java/edu/harvard/iq/dataverse/datavariable/VariableMetadata.java

@@ -71,6 +71,7 @@ public class VariableMetadata implements Serializable  {
     /**
      * universe: metadata variable field.
      */
+    @Column(columnDefinition="TEXT")
     private String universe;
 
     /**

src/main/resources/db/migration/V5.13.0.3__9728-universe-variablemetadata.sql

@@ -0,0 +1,2 @@
+-- increase field universe from 255 to text
+ALTER TABLE variablemetadata ALTER COLUMN universe TYPE text;