niv ic-ref: update ad6ea9e5 -> 9edd0fdd (#2012)

## Changelog for ic-ref:
Branch: release-0.11
Commits: [dfinity-lab/[email protected]](https://github.com/dfinity-lab/ic-ref/compare/ad6ea9e56295342e3eb4cdd8c46e2b27796cb2a1...9edd0fdda006519118ed40515b84c74f69c59bc1)

* [`71fccfe3`](https://github.com/dfinity-lab/ic-ref/commit/71fccfe393bd5ce1234a67b729f66a75cbb15c3d) Public Spec: Add ic-deposit_funds ([dfinity-lab/ic-ref⁠#160](http://r.duckduckgo.com/l/?uddg=https://github.com/dfinity-lab/ic-ref/issues/160))
* [`9edd0fdd`](https://github.com/dfinity-lab/ic-ref/commit/9edd0fdda006519118ed40515b84c74f69c59bc1) ic-ref(-test): Implement deposit_funds

Author: dfinity-bot

nix/sources.json

@@ -22,7 +22,7 @@
     "ic-ref": {
         "ref": "release-0.11",
         "repo": "ssh://[email protected]/dfinity-lab/ic-ref",
-        "rev": "ad6ea9e56295342e3eb4cdd8c46e2b27796cb2a1",
+        "rev": "9edd0fdda006519118ed40515b84c74f69c59bc1",
         "type": "git"
     },
     "libtommath": {