Fix numpy2 compatibility

More details here:
https://numpy.org/doc/stable/dev/depending_on_numpy.html#numpy-2-0-specific-advice

and regarding np.sctypes:
numpy/numpy#26778

libtiff/libtiff_ctypes.py

@@ -21,6 +21,13 @@
 
 __all__ = ['libtiff', 'TIFF']
 
+SCTYPES = {
+    "float": [np.float16, np.float32, np.float64],
+    "uint": [np.uint8, np.uint16, np.uint32, np.uint64, np.bool_],
+    "int": [np.int8, np.int16, np.int32, np.int64],
+    "complex": [np.complex64, np.complex128],
+}
+
 cwd = os.getcwd()
 try:
     os.chdir(os.path.dirname(__file__))
@@ -729,13 +736,13 @@ def write_image(self, arr, compression=None, write_rgb=False):
         compression = self._fix_compression(compression)
 
         arr = np.ascontiguousarray(arr)
-        if arr.dtype in np.sctypes['float']:
+        if arr.dtype in SCTYPES["float"]:
             sample_format = SAMPLEFORMAT_IEEEFP
-        elif arr.dtype in np.sctypes['uint'] + [np.bool_]:
+        elif arr.dtype in SCTYPES["uint"]:
             sample_format = SAMPLEFORMAT_UINT
-        elif arr.dtype in np.sctypes['int']:
+        elif arr.dtype in SCTYPES["int"]:
             sample_format = SAMPLEFORMAT_INT
-        elif arr.dtype in np.sctypes['complex']:
+        elif arr.dtype in SCTYPES["complex"]:
             sample_format = SAMPLEFORMAT_COMPLEXIEEEFP
         else:
             raise NotImplementedError(repr(arr.dtype))
@@ -816,13 +823,13 @@ def write_tiles(self, arr, tile_width=None, tile_height=None,
                     compression=None, write_rgb=False):
         compression = self._fix_compression(compression)
 
-        if arr.dtype in np.sctypes['float']:
+        if arr.dtype in SCTYPES["float"]:
             sample_format = SAMPLEFORMAT_IEEEFP
-        elif arr.dtype in np.sctypes['uint'] + [np.bool_]:
+        elif arr.dtype in SCTYPES["uint"]:
             sample_format = SAMPLEFORMAT_UINT
-        elif arr.dtype in np.sctypes['int']:
+        elif arr.dtype in SCTYPES["int"]:
             sample_format = SAMPLEFORMAT_INT
-        elif arr.dtype in np.sctypes['complex']:
+        elif arr.dtype in SCTYPES["complex"]:
             sample_format = SAMPLEFORMAT_COMPLEXIEEEFP
         else:
             raise NotImplementedError(repr(arr.dtype))

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=60", "wheel", "setuptools_scm[toml]>=8.0", 'oldest-supported-numpy']
+requires = ["setuptools>=60", "wheel", "setuptools_scm[toml]>=8.0", "numpy>=2.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]

setup.py

@@ -28,10 +28,10 @@ def setup_package():
             "Intended Audience :: Science/Research",
             "License :: OSI Approved",
             "Programming Language :: Python",
-            "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",
+            "Programming Language :: Python :: 3.12",
             "Topic :: Scientific/Engineering",
             "Topic :: Software Development",
             "Operating System :: Microsoft :: Windows",
@@ -42,8 +42,8 @@ def setup_package():
         description='PyLibTiff: a Python tiff library.',
         long_description=long_description,
         long_description_content_type='text/markdown',
-        install_requires=['numpy>=1.13.3'],
-        python_requires='>=3.8',
+        install_requires=['numpy>=1.24.5'],
+        python_requires='>=3.9',
         extras_require={
             'bitarray': ['bitarray'],
         },