Update kusama.json

My previous PR https://github.com/w3f/1k-validators-be/pull/2891/files changed the wrong stash. This PR corrects that.

Author: MathCryptoDoc

candidates/kusama.json

@@ -3098,8 +3098,8 @@
     },
     {
       "slotId": 447,
-      "name": "maths-valids-1",
-      "stash": "Dek7ze8nGoTWpuperdvx6nmyZtb41CQN97ypX9enfT9jM5S",
+      "name": "maths-valids-5",
+      "stash": "EYvNriDFcDw7KXVjEDsQEpky4RXxXcrYGrS9Dg9Q866yDSs",
       "riotHandle": "@mathcrypto:matrix.org",
       "kyc": false
     },