Dcnum

- enh: support passing a single file to `concatenated_hdf5_data`

- enh: request single threaded operations when going into mp.Process (17)
- enh: new module `dcnum.single_thread_osenv`

- setup: officially support numpy 2
- setup: pin dependencies

- fix: catch ValueError when computing relative path on different anchors
- ref: replace np.string_ with np.bytes_
- ref: remove unused `data` argument to QueueCollectorThread
- ref: minor speed-up for QueueCollectorThread

- feat: identify flickering in raw data via dcnum.read.detect_flickering
- fix: handle out-of-bounds slice indexing for BaseImageChunkCache
- fix: np.bool_ and np.floating not recognized in PPID parsing

- feat: add support for internal basins
- feat: "image_bg" as internal basin for "sparsemed" background computer
- fix: "sparsmed" background computer attributed background images with
an offset of `split_time` (the fist event obtained the background image
of the first event of the first second and so on)
- enh: support numpy indexing for mapped basins
- enh: add new `write.copy_basins` method
- ref: return `h5py.Group` in `HDF5Data.get_basin_data` instead of
a basin `HDF5Data` instance
- ref: perform "plumbing" before "cleanup" in pipeline
- ref: increment DCNUM_PPID_GENERATION to 11