niv ic-hs: update 4692d0af -> c30a8c52 (#2826)

## Changelog for ic-hs:
Branch: master
Commits: [dfinity/ic-hs@4692d0af...c30a8c52](dfinity/ic-hs@4692d0a...c30a8c5)

* [`c30a8c52`](dfinity/ic-hs@c30a8c5) Configure mergify ([dfinity/ic-hs⁠#42](http://r.duckduckgo.com/l/?uddg=https://github.com/dfinity/ic-hs/issues/42))

nix/sources.json

@@ -40,10 +40,10 @@
         "homepage": "",
         "owner": "dfinity",
         "repo": "ic-hs",
-        "rev": "4692d0af3578d3695ead8987698e59f4798b8c9e",
-        "sha256": "19wjgx3ag5c0hj1pqbifi4zgxj1xmfjwraag9zdwnix05d70fgvj",
+        "rev": "c30a8c52894e7496dc52ce7e0f02db237096a7ca",
+        "sha256": "1rp21z2c3ff0whzw04csp56kzj0dp9clqcyw4vm3g01sy9hkzcjw",
         "type": "tarball",
-        "url": "https://github.com/dfinity/ic-hs/archive/4692d0af3578d3695ead8987698e59f4798b8c9e.tar.gz",
+        "url": "https://github.com/dfinity/ic-hs/archive/c30a8c52894e7496dc52ce7e0f02db237096a7ca.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "libtommath": {