update to VO-DML tools 0.5.21

and change the default place to look for snapshots

Author: pahjbo

build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
     // this plugin provides all the vo-dml functionality
-    id("net.ivoa.vo-dml.vodmltools") version "0.5.20"
+    id("net.ivoa.vo-dml.vodmltools") version "0.5.21"
 }
 
 vodml {

settings.gradle.kts

@@ -9,7 +9,7 @@ dependencyResolutionManagement {
         will not be necessary when this library is released as a non-SNAPSHOT version.
          */
         maven {
-            url= uri("https://oss.sonatype.org/content/repositories/snapshots/")
+            url= uri("https://central.sonatype.com/repository/maven-snapshots/")
         }
     }
 }