feat(osfingermap): add support for `Debian 11` [skip ci]

mysql/osfingermap.yaml

@@ -2,6 +2,15 @@
 # vim: ft=yaml
 ---
 # Debian
+Debian-11:
+  serverpkg: mariadb-server
+  service: mariadb
+  clientpkg: mariadb-client
+  devpkg: libmariadbclient-dev
+  config:
+    append: |
+      !includedir /etc/mysql/conf.d/
+      # !includedir /etc/mysql/mariadb.conf.d/
 Debian-10:
   serverpkg: mariadb-server
   service: mariadb