niv ic-hs: update eef711d1 -> 91832636 (#3276)

## Changelog for ic-hs:
Branch: master
Commits: [dfinity/ic-hs@eef711d1...91832636](dfinity/ic-hs@eef711d...9183263)

* [`4920ec29`](dfinity/ic-hs@4920ec2) System API for ECDSA signing ([dfinity/ic-hs⁠#79](https://togithub.com/dfinity/ic-hs/issues/79))
* [`47b7f0b6`](dfinity/ic-hs@47b7f0b) Mirror changes of the spec related to the canister HTTP calls ([dfinity/ic-hs⁠#85](https://togithub.com/dfinity/ic-hs/issues/85))
* [`91832636`](dfinity/ic-hs@9183263) upgrade nixpkgs to release-22.05 ([dfinity/ic-hs⁠#76](https://togithub.com/dfinity/ic-hs/issues/76))

nix/sources.json

@@ -40,10 +40,10 @@
         "homepage": "",
         "owner": "dfinity",
         "repo": "ic-hs",
-        "rev": "eef711d1d9e731fbf854c992bfa6f13e11362523",
-        "sha256": "0h1jnabl6ppb7v78hijjd62mkqrj3l0gfb340pdmi7rzqbp7ddz1",
+        "rev": "918326366260eed8d4673382277501df977741fc",
+        "sha256": "1nvzspi8g52cw9hpymsqw3yjk4qd7rdpq0bcfkdagd17hycfi2hb",
         "type": "tarball",
-        "url": "https://github.com/dfinity/ic-hs/archive/eef711d1d9e731fbf854c992bfa6f13e11362523.tar.gz",
+        "url": "https://github.com/dfinity/ic-hs/archive/918326366260eed8d4673382277501df977741fc.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "libtommath": {