sunshine: fix /bin/sleep in systemd service (#395760)

pkgs/by-name/su/sunshine/package.nix

@@ -47,6 +47,7 @@
   miniupnpc,
   nlohmann_json,
   config,
+  coreutils,
   cudaSupport ? config.cudaSupport,
   cudaPackages ? { },
 }:
@@ -200,7 +201,8 @@ stdenv'.mkDerivation rec {
 
     substituteInPlace packaging/linux/sunshine.service.in \
       --subst-var-by PROJECT_DESCRIPTION 'Self-hosted game stream host for Moonlight' \
-      --subst-var-by SUNSHINE_EXECUTABLE_PATH $out/bin/sunshine
+      --subst-var-by SUNSHINE_EXECUTABLE_PATH $out/bin/sunshine \
+      --replace-fail '/bin/sleep' '${lib.getExe' coreutils "sleep"}'
   '';
 
   preBuild = ''