python312Packages.pyqtgraph: unbreak by using pyqt6

The symptom that caused it to be broken with Python 3.12 and PyQt5 was
similar to this:

https://github.com/moosepy/curvefitgui/issues/2

However we won't put any effort into fixing it, because PyQt5 and
PySide2 are close to EOL since Qt5 is close to EOL.

pkgs/development/python-modules/pyqtgraph/default.nix

@@ -5,9 +5,9 @@
   fetchFromGitHub,
   scipy,
   numpy,
-  pyqt5,
+  pyqt6,
   pyopengl,
-  qt5,
+  qt6,
   pytestCheckHook,
   freefont_ttf,
   makeFontsConf,
@@ -41,13 +41,13 @@ buildPythonPackage rec {
     # Not propagating it so that every consumer of this package will be able to
     # use any of the upstream supported Qt Library, See:
     # https://pyqtgraph.readthedocs.io/en/pyqtgraph-0.13.7/getting_started/how_to_use.html#pyqt-and-pyside
-    pyqt5
+    pyqt6
   ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
   preCheck = ''
-    export QT_PLUGIN_PATH="${qt5.qtbase.bin}/${qt5.qtbase.qtPluginPrefix}"
+    export QT_PLUGIN_PATH="${lib.getBin qt6.qtbase}/${qt6.qtbase.qtPluginPrefix}"
     export QT_QPA_PLATFORM=offscreen
     export DYLD_FRAMEWORK_PATH=/System/Library/Frameworks
     export FONTCONFIG_FILE=${fontsConf}
@@ -75,7 +75,6 @@ buildPythonPackage rec {
     homepage = "https://www.pyqtgraph.org/";
     changelog = "https://github.com/pyqtgraph/pyqtgraph/blob/master/CHANGELOG";
     license = licenses.mit;
-    broken = lib.versionAtLeast python.version "3.12";
     platforms = platforms.unix;
     maintainers = with maintainers; [ koral ];
   };