niv ic-hs: update 0f87c270 -> 20e23e1a (#3615)

## Changelog for ic-hs:
Branch: master
Commits: [dfinity/ic-hs@0f87c270...20e23e1a](dfinity/ic-hs@0f87c27...20e23e1)

* [`8c2207ee`](dfinity/ic-hs@8c2207e) query balance and balance128 within the same query ([dfinity/ic-hs⁠#106](https://togithub.com/dfinity/ic-hs/issues/106))
* [`5a076ad1`](dfinity/ic-hs@5a076ad) rename canister state counter to canister version ([dfinity/ic-hs⁠#109](https://togithub.com/dfinity/ic-hs/issues/109))
* [`d095478b`](dfinity/ic-hs@d095478) Include ic-ref-test and universal canister in release build artifacts ([dfinity/ic-hs⁠#111](https://togithub.com/dfinity/ic-hs/issues/111))
* [`3a58e164`](dfinity/ic-hs@3a58e16) Add canister global timer ([dfinity/ic-hs⁠#107](https://togithub.com/dfinity/ic-hs/issues/107))
* [`c863b6ef`](dfinity/ic-hs@c863b6e) fix provisional top up test ([dfinity/ic-hs⁠#112](https://togithub.com/dfinity/ic-hs/issues/112))
* [`2cd76efb`](dfinity/ic-hs@2cd76ef) run system tasks periodically ([dfinity/ic-hs⁠#113](https://togithub.com/dfinity/ic-hs/issues/113))
* [`3c2eb69a`](dfinity/ic-hs@3c2eb69) narrow down gap for canister http_requests between ic-ref(-test) and Interface Spec ([dfinity/ic-hs⁠#100](https://togithub.com/dfinity/ic-hs/issues/100))
* [`fb76b646`](dfinity/ic-hs@fb76b64) ic-ref-run: Execute heartbeats before any submitted message ([dfinity/ic-hs⁠#114](https://togithub.com/dfinity/ic-hs/issues/114))
* [`20e23e1a`](dfinity/ic-hs@20e23e1) do not return an HTTP error for calls to stopping/stopped canisters ([dfinity/ic-hs⁠#115](https://togithub.com/dfinity/ic-hs/issues/115))

nix/sources.json

@@ -40,10 +40,10 @@
         "homepage": "",
         "owner": "dfinity",
         "repo": "ic-hs",
-        "rev": "0f87c27013c46454b4d8898e5893a8d64a01627d",
-        "sha256": "0vn6w86fgmy40nyf9zpn97xfhxnkifhfsa4hb6pshvyw3i3j8r3f",
+        "rev": "20e23e1ab496cbd2bc3b687a71e381edc8299da1",
+        "sha256": "1cmync8lqfi6nfmvdga091cdns1y32l8ypmbvlb5l850zy8l3h1w",
         "type": "tarball",
-        "url": "https://github.com/dfinity/ic-hs/archive/0f87c27013c46454b4d8898e5893a8d64a01627d.tar.gz",
+        "url": "https://github.com/dfinity/ic-hs/archive/20e23e1ab496cbd2bc3b687a71e381edc8299da1.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "libtommath": {

test/run-drun/heartbeat.mo

@@ -8,7 +8,9 @@ actor {
   var max = 10;
 
   public shared func inc() : async () {
-    count := count + 1;
+    if (count < max) {
+      count := count + 1;
+    }
   };
 
   system func heartbeat() : async () {
@@ -32,5 +34,6 @@ actor {
 //SKIP run
 //SKIP run-low
 //SKIP run-ir
+//SKIP ic-ref-run
 
 //CALL ingress go "DIDL\x00\x00"