Fix handwired/frenchdev keyboard dimensions in info.json

keyboards/handwired/frenchdev/info.json

@@ -4,7 +4,7 @@
   "maintainer": "qmk",
   "bootloader": "",
   "width": 20,
-  "height": 8,
+  "height": 9.5,
   "layouts": {
     "LAYOUT": {
       "layout": [