Merge #247395: gphotos-sync: relax pyyaml dependency

...into staging-next

pkgs/tools/backup/gphotos-sync/default.nix

···
   version = "3.1.2";
   format = "pyproject";
 
-  SETUPTOOLS_SCM_PRETEND_VERSION = version;
+  env.SETUPTOOLS_SCM_PRETEND_VERSION = version;
 
   src = fetchFromGitHub {
     owner = "gilesknap";
···
   ];
 
   nativeBuildInputs = [ python3.pkgs.pythonRelaxDepsHook ];
+
   pythonRelaxDeps = [
     "psutil"
     "exif"
+    "pyyaml"
   ];
 
   propagatedBuildInputs = with python3.pkgs; [