Cast Dib handle to int

[radarhere]

Resolves #8383

The Dib class passes handle to core method getdc() in expose()

Pillow/src/PIL/ImageWin.py

Lines 101 to 102 in b67f018

	if isinstance(handle, HWND):
	dc = self.image.getdc(handle)

but despite what our Python logic would lead you to expect, it must be an integer. See the following code and https://docs.python.org/3/c-api/arg.html#numbers

Pillow/src/display.c

Lines 37 to 41 in b67f018

	#if SIZEOF_VOID_P == 8
	#define F_HANDLE "K"
	#else
	#define F_HANDLE "k"
	#endif

Pillow/src/display.c

Lines 165 to 169 in b67f018

	_getdc(ImagingDisplayObject *display, PyObject *args) {
	HWND window;
	HDC dc;
	if (!PyArg_ParseTuple(args, F_HANDLE, &window)) {

So this PR casts it to an integer in Python first. The same logic also applies to draw() and query_palette().