Apply suggestion from @Rom1-B

Author: Rom1-B

plugin.xml

@@ -103,6 +103,11 @@ Il existe un [script de migration](https://github.com/pluginsGLPI/customfields/b
          <compatibility>~11.0.2</compatibility>
          <download_url>https://github.com/pluginsGLPI/fields/releases/download/1.24.0/glpi-fields-1.24.0.tar.bz2</download_url>
       </version>
+      <version>
+         <num>1.21.29</num>
+         <compatibility>~10.0.11</compatibility>
+         <download_url>https://github.com/pluginsGLPI/fields/releases/download/1.21.29/glpi-fields-1.21.29.tar.bz2</download_url>
+      </version>
       <version>
          <num>1.23.4</num>
          <compatibility>~11.0.2</compatibility>