fix: Qt6, creating QColor from Float

[clst]

When I tried the git version from AUR on my Arch install it crashed when drawing the Chart.

Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/visram/app.py", line 65, in onResultsReady
    self.chart.updateChart(process_graph)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/visram/app.py", line 124, in updateChart
    angle = self.drawProcess(pid, angle, 0,
                             process_graph)
  File "/usr/lib/python3.13/site-packages/visram/app.py", line 141, in drawProcess
    self.drawWedge(color, angle, angle2, depth, depth + 1, pid,
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                   process_graph)
                   ^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/visram/app.py", line 177, in drawWedge
    brush = QtGui.QBrush(QtGui.QColor(*(c * 255 for c in color)))
                         ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: arguments did not match any overloaded call:
  QColor(color: Qt.GlobalColor): argument 1 has unexpected type 'numpy.float64'
  QColor(rgb: int): argument 1 has unexpected type 'numpy.float64'
  QColor(rgba64: QRgba64): argument 1 has unexpected type 'numpy.float64'
  QColor(variant: Any): too many arguments
  QColor(): too many arguments
  QColor(r: int, g: int, b: int, alpha: int = 255): argument 1 has unexpected type 'numpy.float64'
  QColor(aname: Optional[str]): argument 1 has unexpected type 'numpy.float64'
  QColor(acolor: Union[QColor, Qt.GlobalColor]): argument 1 has unexpected type 'numpy.float64'

This fixes it.