Easy-thumbnails

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* Drop support for Python-3.8.
* Drop support for Django-4.1 and earlier.
* Add support for Django-5.1.
* Experimental support for animated image formats. See documentation for more infos.
* Fix 642: Do not scale images (SVG) without size information.
* Fix 366: Keep ICC profile when saving image, if present.

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* Add support for Django 4.2 storages (mandatory in Django 5.1).

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* Fix regression introduced in version 2.8.4. Argument ``quality`` is not removed for images
of type ``.webp``.

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* Fix problem when thumbnailing images of type TIFF. PIL's ``TiffImagePlugin`` doesn't
like argument ``quality``.
* Replace deprecated Pillow constants against newer counterparts. Check
https://pillow.readthedocs.io/en/stable/releasenotes/9.1.0.html#deprecations for details.

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* Fix regression in library detection introduced in version 2.8.2.

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* Installation of easy-thumbnails now optionally depends on the reportlab library.