renderdoc: fallback to python312 if shiboken2 is not available

shiboken2 is marked  broken on python313, and python3 will default to python313 in the next staging-next merge

pkgs/by-name/re/renderdoc/package.nix

@@ -14,6 +14,7 @@
   pcre,
   pkg-config,
   python3Packages,
+  python312Packages,
   qt5,
   stdenv,
   vulkan-loader,
@@ -23,6 +24,9 @@
 }:
 
 let
+  pythonPackages' =
+    # lib.meta.availableOn does not respect meta.broken?
+    if python3Packages.shiboken2.meta.available then python3Packages else python312Packages;
   custom_swig = fetchFromGitHub {
     owner = "baldurk";
     repo = "swig";
@@ -51,9 +55,9 @@ stdenv.mkDerivation (finalAttrs: {
     [
       libXdmcp
       libpthreadstubs
-      python3Packages.pyside2
-      python3Packages.pyside2-tools
-      python3Packages.shiboken2
+      pythonPackages'.pyside2
+      pythonPackages'.pyside2-tools
+      pythonPackages'.shiboken2
       qt5.qtbase
       qt5.qtsvg
       vulkan-loader
@@ -71,7 +75,7 @@ stdenv.mkDerivation (finalAttrs: {
     makeWrapper
     pcre
     pkg-config
-    python3Packages.python
+    pythonPackages'.python
     qt5.qtx11extras
     qt5.wrapQtAppsHook
   ];