Drop markdown which is not used by GEO and not D9 compatible yet

Also add microformats (Drutopia standard) and upgrade migrate modules
(also Drutopia standard) to D9-compatible ones.

composer.json

@@ -62,10 +62,10 @@
         "drupal/link_attributes": "^1.9",
         "drupal/linkit": "^6",
         "drupal/mailchimp": "^1.10",
-        "drupal/markdown": "^1.3",
         "drupal/menu_link_config": "^1.0@alpha",
-        "drupal/migrate_plus": "^4.2",
-        "drupal/migrate_source_csv": "3.1",
+        "drupal/microformats": "^2",
+        "drupal/migrate_plus": "^5",
+        "drupal/migrate_source_csv": "^3",
         "drupal/migrate_tools": "^4.1",
         "drupal/migrate_upgrade": "^3",
         "drupal/minimalhtml": "^1.1",