docs(metadata): update metadata

Author: btry

plugin.xml

@@ -25,6 +25,11 @@ Carbon est un plugin permettant d'évaluer l'impact environnemental de votre inf
       <author>Teclib'</author>
    </authors>
    <versions>
+      <version>
+         <num>1.2.0-beta.2</num>
+         <compatibility>~11.0</compatibility>
+         <download_url>https://github.com/pluginsGLPI/carbon/releases/download/1.2.0-beta.2/glpi-carbon-1.2.0-beta.2.tar.bz2</download_url>
+      </version>
       <version>
          <num>1.2.0-beta.1</num>
          <compatibility>~11.0</compatibility>