nodejs: pin icu to newer version

Not-cherry-picked-because: icu will be advanced globally on the unstable branch by https://github.com/NixOS/nixpkgs/pull/520553
Signed-off-by: Marcin Serwin <marcin@serwin.dev>
(cherry picked from commit 4b965d7e22e3f82c9e9c77dd51bdd70679f0a904)

pkgs/development/web/nodejs/nodejs.nix

@@ -47,7 +47,7 @@
   uvwasi,
   zlib,
   zstd,
-  icu,
+  icu78,
   bash,
   ninja,
   pkgconf,
@@ -274,7 +274,7 @@ let
       # that use bash wrappers, e.g. polaris-web.
       buildInputs = [
         bash
-        icu
+        icu78
       ]
       ++ builtins.attrValues sharedLibDeps;