text: Title: Memleak in arrayToQPath() function
  Body: 
  ### Short description
  Using ErrorBarItem with PlotWidget causes small and gradual memleaks that become noticable when app is running a longer time.
  
  ### Code to reproduce
  This code is extracted from **ErrorBarItem.drawPath()** -> **arrayToQPath(..., connect="pairs")** which builds QPainterPath using QByteArray and numpy buffer interface.
  
  Note that the same behaviour can be easily reproduced by calling **ErrorBarItem.drawPath()** repeatedly. Only the run is slower.
  
  ```python
  import numpy as np
  from pyqtgraph.Qt import QtCore
  
  if __name__ == '__main__':
      n = 1024
  
      for i in range(100000):
          if i % 1000 == 0:
              print('step', i)
  
          backstore = QtCore.QByteArray()
          backstore.resize(n * 8)
          np.frombuffer(backstore, dtype=[('x', '>f8')], count=n)
  
      input('done')
  ```
  
  ### Tested environment(s)
  
   * PyQtGraph version: 0.13.7
   * Qt Python binding: PySide6 6.8.2 Qt 6.8.2
   * Python version: 3.12.9
   * NumPy version: 2.1.3
   * Operating system: Linux HOST 5.4.191-el7.lime.2.x86_64 # 1 SMP Thu Jul 14 19:09:52 EDT 2022 x86_64 x86_64 x86_64 GNU/Linux
   * Installation method: conda
  
  ### Additional context
  I'm not sure if this bug is part of Qt or numpy, but it triggers inside pyqtgraph. As a workaround it would help to clear QByteArray before end of `arrayToQPath()`. In which case the memory footprint of the leak is very small.