niv ic-wasm: update 12f4cb76 -> f3bcbf19

## Changelog for ic-wasm:
Branch: main
Commits: [dfinity/ic-wasm@12f4cb76...f3bcbf19](dfinity/ic-wasm@12f4cb7...f3bcbf1)

* [`f3bcbf19`](dfinity/ic-wasm@f3bcbf1) use 64bit API for stable memory ([dfinity/ic-wasm⁠#76](https://togithub.com/dfinity/ic-wasm/issues/76))

nix/sources.json

@@ -51,10 +51,10 @@
         "homepage": null,
         "owner": "dfinity",
         "repo": "ic-wasm",
-        "rev": "12f4cb76d0861aa7f72cea5741656213b4ef723b",
-        "sha256": "1ayxzgh2bvmj4c4yl9q20fmr00kyil6475lsfcwrvslg34s3lqlv",
+        "rev": "f3bcbf19237870cd13e658e24d065d90f33ddc2e",
+        "sha256": "13ca93pbr34ivgs312xczw741ksz01n3q56340yyfvqc0v2jn6i7",
         "type": "tarball",
-        "url": "https://github.com/dfinity/ic-wasm/archive/12f4cb76d0861aa7f72cea5741656213b4ef723b.tar.gz",
+        "url": "https://github.com/dfinity/ic-wasm/archive/f3bcbf19237870cd13e658e24d065d90f33ddc2e.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "libtommath": {