Use numpy>=2 as build dependency only for python>=3.9

[t20100]

This PR proposes to use dependency specifiers in the build-system's requires to use numpy>2 only for versions of Python that supports it.

Closes #187

[dkriegner]

/AzurePipelines run

thanks for this contribution. This is fine for me. It should not affect anything on the azure pipelines and the automatic builds for PyPI since they only run for python >= 3.9

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[dkriegner]

/AzurePipelines run

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[t20100]

I tried to use oldest-supported-numpy instead of numpy for python<3.9 which would make the build more compatible... but it fails to install, so I left numpy.

Test TestIO_PerkinElmer.test_tiffread fails with Python3.12:

Logs

``` .tif, .bin and .bin.xz path : str, optional path of the data files """ if path: full_filename = os.path.join(path, filename) else: full_filename = filename if config.VERBOSITY >= config.INFO_ALL: print(f"XU.io.ImageReader.readImage: file {full_filename}") t1 = time.time() with xu_open(full_filename) as fh: # jump over header fh.seek(self.hdrlen) # read image rlen = numpy.dtype(self.dtype).itemsize * self.nop1 * self.nop2 img = numpy.frombuffer(fh.read(rlen), dtype=self.dtype) if self.byteswap: img = img.byteswap() > img.shape = (self.nop1, self.nop2) # reshape the data E ValueError: cannot reshape array of size 0 into shape (2048,2048) /opt/hostedtoolcache/Python/3.12.4/x64/lib/python3.12/site-packages/xrayutilities/io/imagereader.py:159: ValueError =============================== warnings summary =============================== tests/test_io_perkinelmer.py::TestIO_PerkinElmer::test_tiffread /opt/hostedtoolcache/Python/3.12.4/x64/lib/python3.12/site-packages/xrayutilities/io/imagereader.py:155: RuntimeWarning: overflow encountered in scalar multiply rlen = numpy.dtype(self.dtype).itemsize * self.nop1 * self.nop2 ```

[dkriegner]

The test failure is weird and certainly unrelated to your change. If it reproduces I will investigate.

[dkriegner]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[dkriegner]

I will merge this despite the error. My feeling is that it is a download problem of the test data. If the problem persists on the main branch I will fix it in a separate PR. thanks again for the contribution.