fix(niimprint): relax dependency

packages/niimprint.nix

@@ -1,5 +1,6 @@
 {
   buildPythonApplication,
+  pythonRelaxDepsHook,
   fetchFromGitHub,
   poetry-core,
   pyserial,
@@ -22,6 +23,7 @@ in
     pyproject = true;
 
     nativeBuildInputs = [
+      pythonRelaxDepsHook
       poetry-core
     ];
 
@@ -31,6 +33,10 @@ in
       click
     ];
 
+    pythonRelaxDeps = [
+      "pillow"
+    ];
+
     postInstall = ''
       install -d $out/bin
       echo '#!/usr/bin/env python' > $out/bin/${mainProgram}