Fix deprecations from NumPy

[QuLogic]

This fixes several deprecation warnings from NumPy when running the tests:

cartopy/lib/cartopy/tests/test_polygon.py:257: DeprecationWarning: In future, it will be an error for 'np.bool_' scalars to be interpreted as an index
  for i in range(boundary[0], regions.max(), 2):

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)
cartopy/lib/cartopy/img_transform.py:78: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)
cartopy/lib/cartopy/img_transform.py:78: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)
cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)
cartopy/lib/cartopy/img_transform.py:78: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:78: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/img_transform.py:76: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  endpoint=False)

cartopy/lib/cartopy/vector_transform.py:63: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  x_grid, y_grid = np.meshgrid(np.linspace(0, 1, nx),

code/cartopy/lib/cartopy/vector_transform.py:63: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  x_grid, y_grid = np.meshgrid(np.linspace(0, 1, nx),

cartopy/lib/cartopy/vector_transform.py:63: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  x_grid, y_grid = np.meshgrid(np.linspace(0, 1, nx),

code/cartopy/lib/cartopy/vector_transform.py:63: DeprecationWarning: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
  x_grid, y_grid = np.meshgrid(np.linspace(0, 1, nx),