niv ic-hs: update e727feca -> a5f89cf5 (#4672)

## Changelog for ic-hs:
Branch: master
Commits: [dfinity/ic-hs@e727feca...a5f89cf5](dfinity/ic-hs@e727fec...a5f89cf)

* [`99efc33f`](dfinity/ic-hs@99efc33) sync node height before making an update call in compliance tests ([dfinity/ic-hs⁠#213](https://togithub.com/dfinity/ic-hs/issues/213))
* [`4bdf6c35`](dfinity/ic-hs@4bdf6c3) sync node height before getStateCert ([dfinity/ic-hs⁠#214](https://togithub.com/dfinity/ic-hs/issues/214))
* [`f718f74d`](dfinity/ic-hs@f718f74) retry on http status of 429 ([dfinity/ic-hs⁠#215](https://togithub.com/dfinity/ic-hs/issues/215))
* [`a5f89cf5`](dfinity/ic-hs@a5f89cf) add note that DFINITY stopped contributing ([dfinity/ic-hs⁠#216](https://togithub.com/dfinity/ic-hs/issues/216))

nix/sources.json

@@ -39,10 +39,10 @@
         "homepage": "",
         "owner": "dfinity",
         "repo": "ic-hs",
-        "rev": "e727fecab6bad1401a65a50773637e46b8a14e0e",
-        "sha256": "183xcavjkfsa2hgx9s67qxg7hfykykmw0wbzd4458rkiqb164wmc",
+        "rev": "a5f89cf508b0c80b633e3f0c152e3406fb750189",
+        "sha256": "0sjj272ch14309h3n3cxq6g7jkdhhqmdjrjdg67w1xxk4k1s1sfn",
         "type": "tarball",
-        "url": "https://github.com/dfinity/ic-hs/archive/e727fecab6bad1401a65a50773637e46b8a14e0e.tar.gz",
+        "url": "https://github.com/dfinity/ic-hs/archive/a5f89cf508b0c80b633e3f0c152e3406fb750189.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "ic-wasm": {