numpy 2 deprecation warnings

[t20100]

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Following #4082, those deprecation warnings are raised with numpy2 RC1:

gui/plot/test/testCurvesROIWidget.py: 14 warnings
  silx/gui/plot/CurvesROIWidget.py:1243: DeprecationWarning: `trapz` is deprecated. Use `trapezoid` instead, or one of the numerical integration functions in `scipy.integrate`.
    rawArea = numpy.trapz(y, x=x)

gui/plot/test/testCurvesROIWidget.py: 14 warnings
  silx/gui/plot/CurvesROIWidget.py:1249: DeprecationWarning: `trapz` is deprecated. Use `trapezoid` instead, or one of the numerical integration functions in `scipy.integrate`.
    background = numpy.trapz(yBackground, x=x)

gui/plot/test/testCurvesROIWidget.py::TestCurvesROIWidget::testAreaCalculation
  silx/gui/plot/test/testCurvesROIWidget.py:174: DeprecationWarning: `trapz` is deprecated. Use `trapezoid` instead, or one of the numerical integration functions in `scipy.integrate`.
    (numpy.trapz(y=[10, 20], x=[10, 20]), 0.0),

gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
  silx/gui/plot/items/scatter.py:730: DeprecationWarning: Arrays of 2-dimensional vectors are deprecated. Use arrays of 3-dimensional vectors instead. (deprecated in NumPy 2.0)
    + numpy.cross(points[0, 1:] - points[0, :-1], (0.0, 0.0, 1.0))[

gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
gui/plot/test/testPlotWidget.py::TestPlotScatter_Gl::testGridVisualization
  silx/gui/plot/items/scatter.py:736: DeprecationWarning: Arrays of 2-dimensional vectors are deprecated. Use arrays of 3-dimensional vectors instead. (deprecated in NumPy 2.0)
    + numpy.cross(points[0, -1] - points[0, -2], (0.0, 0.0, 1.0))[

gui/plot/tools/test/testRoiItems.py::testArc_getToSetGeometry
  silx/gui/plot/items/_arc_roi.py:635: DeprecationWarning: Arrays of 2-dimensional vectors are deprecated. Use arrays of 3-dimensional vectors instead. (deprecated in NumPy 2.0)
    elif numpy.linalg.norm(numpy.cross(mid - start, end - start)) < 1e-5:

io/test/test_h5py_utils.py: 10 warnings
  multiprocessing/popen_fork.py:66: DeprecationWarning: This process (pid=770) is multi-threaded, use of fork() may lead to deadlocks in the child.
    self.pid = os.fork()

opencl/sift/test/test_align.py::TestLinalign::test_align
opencl/sift/test/test_align.py::TestLinalign::test_align
  silx/opencl/sift/alignment.py:327: DeprecationWarning: Conversion of an array with ndim > 0 to a scalar is deprecated, and will error in future. Ensure you extract a single element from your array before performing this operation. (Deprecated NumPy 1.25.)
    matrix[0, 0], matrix[0, 1] = transform_matrix[4], transform_matrix[3]

opencl/sift/test/test_align.py::TestLinalign::test_align
opencl/sift/test/test_align.py::TestLinalign::test_align
  silx/opencl/sift/alignment.py:328: DeprecationWarning: Conversion of an array with ndim > 0 to a scalar is deprecated, and will error in future. Ensure you extract a single element from your array before performing this operation. (Deprecated NumPy 1.25.)
    matrix[1, 0], matrix[1, 1] = transform_matrix[1], transform_matrix[0]

[t20100]

See issue #4101 for:

io/test/test_h5py_utils.py: 10 warnings
  multiprocessing/popen_fork.py:66: DeprecationWarning: This process (pid=770) is multi-threaded, use of fork() may lead to deadlocks in the child.
    self.pid = os.fork()