Issue #3121743 by thalles, paulocs, RenatoG: Update "source" property value

composer.json

@@ -6,7 +6,7 @@
     "homepage": "https://www.drupal.org/project/xmlsitemap",
     "support": {
         "issues": "http://drupal.org/project/issues/xmlsitemap",
-        "source": "http://cgit.drupalcode.org/xmlsitemap"
+        "source": "https://git.drupalcode.org/project/xmlsitemap"
     },
     "require": {
         "ext-xmlwriter": "*"