python3Packages.cirq-pasqal: replace broken dependency substitution with relaxed dep

pkgs/development/python-modules/cirq-pasqal/default.nix

···
 
   sourceRoot = "${src.name}/${pname}";
 
-  postPatch = ''
-    substituteInPlace requirements.txt \
-      --replace-fail "requests~=2.18" "requests"
-  '';
+  build-system = [ setuptools ];
 
-  build-system = [ setuptools ];
+  pythonRelaxDeps = [
+    "requests"
+  ];
 
   dependencies = [
     cirq-core