niv musl-wasi: update c5264e2b -> 5a693184

## Changelog for musl-wasi:
Branch: main
Commits: [WebAssembly/wasi-libc@c5264e2b...5a693184](WebAssembly/wasi-libc@c5264e2...5a69318)

* [`4bac52ea`](WebAssembly/wasi-libc@4bac52e) Remove trailing backtick in README.md ([WebAssembly/wasi-libc⁠#455](https://togithub.com/WebAssembly/wasi-libc/issues/455))
* [`5a693184`](WebAssembly/wasi-libc@5a69318) add `wasm32-wasi-preview2` target ([WebAssembly/wasi-libc⁠#457](https://togithub.com/WebAssembly/wasi-libc/issues/457))

nix/sources.json

@@ -102,10 +102,10 @@
         "homepage": "https://wasi.dev",
         "owner": "WebAssembly",
         "repo": "wasi-libc",
-        "rev": "c5264e2bbe532994d06b039005f2af91bedcc1a6",
-        "sha256": "1skw2jqzaidr2zbzbjw32b36xvqniwf4if8cr4kbpp8vjvh7j2lr",
+        "rev": "5a693184e947b7a30087b91d4afc1a5d06eec885",
+        "sha256": "17k8x7659la3wfbnyn1sjdcv8n27i6wyvrcvjsa67pypqinglrdz",
         "type": "tarball",
-        "url": "https://github.com/WebAssembly/wasi-libc/archive/c5264e2bbe532994d06b039005f2af91bedcc1a6.tar.gz",
+        "url": "https://github.com/WebAssembly/wasi-libc/archive/5a693184e947b7a30087b91d4afc1a5d06eec885.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {