niv musl-wasi: update be1704a9 -> b85d6552 (#4288)

## Changelog for musl-wasi:
Branch: main
Commits: [WebAssembly/wasi-libc@be1704a9...b85d6552](WebAssembly/wasi-libc@be1704a...b85d655)

* [`0edc7aea`](WebAssembly/wasi-libc@0edc7ae) ifdef out pthread_cancel ([WebAssembly/wasi-libc⁠#445](https://togithub.com/WebAssembly/wasi-libc/issues/445))
* [`b85d6552`](WebAssembly/wasi-libc@b85d655) add stubs for dlopen, dlsym, etc. ([WebAssembly/wasi-libc⁠#443](https://togithub.com/WebAssembly/wasi-libc/issues/443))

nix/sources.json

@@ -102,10 +102,10 @@
         "homepage": "https://wasi.dev",
         "owner": "WebAssembly",
         "repo": "wasi-libc",
-        "rev": "be1704a9568e98ae073f074f7271cae68c23d161",
-        "sha256": "193s1ir7dqsazd4wfgkz7vn2zrar3pihqkmrglwm3nxr9lqx1aw8",
+        "rev": "b85d65528d6e17ae1874c6cc6a6a3ac02e83021a",
+        "sha256": "044caqq6nq4y8qw8gg3c5nzs74zshv9jyyzkg67i6mcc81qjr2gm",
         "type": "tarball",
-        "url": "https://github.com/WebAssembly/wasi-libc/archive/be1704a9568e98ae073f074f7271cae68c23d161.tar.gz",
+        "url": "https://github.com/WebAssembly/wasi-libc/archive/b85d65528d6e17ae1874c6cc6a6a3ac02e83021a.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {