wasm-pack: depend on libressl_3_0 explicitly

The application is incompatible with LibreSSL 3.1 because rust-openssl
has a compile-time check for supported LibreSSL versions, and the
version of rust-openssl that wasm-pack depends on does not yet support
LibreSSL 3.1.

pkgs/top-level/all-packages.nix

@@ -26254,6 +26254,9 @@ in
   wasmer = callPackage ../development/interpreters/wasmer { };
 
   wasm-pack = callPackage ../development/tools/wasm-pack {
+    # Wasm-pack depends on a version of rust-openssl which is incompatible with
+    # LibreSSL 3.1, so we explicitly opt for the older version.
+    libressl = libressl_3_0;
     inherit (darwin.apple_sdk.frameworks) Security;
   };