docs: update .all-contributorsrc

.all-contributorsrc

@@ -207,6 +207,17 @@
         "infra",
         "test"
       ]
+    },
+    {
+      "login": "Nitrokey",
+      "name": "Nitrokey",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/9438831?v=4",
+      "profile": "https://www.nitrokey.com",
+      "contributions": [
+        "code",
+        "test",
+        "ideas"
+      ]
     }
   ],
   "contributorsPerLine": 7,