OpenSlide binary build 4.0.1.2 released

[Benjamin Gilbert]

Hi all,

OpenSlide binary build 4.0.1.2 has been released, reducing binary file
sizes and fixing the slidetool self-test on Windows.  For the full
changelog, see below.

openslide-bin 4.0.1.2 is available for download under the terms of the
GNU Lesser General Public License, version 2.1.  If you installed
OpenSlide binaries with pip, you can upgrade with `pip install
--upgrade openslide-bin`.  The binaries are also available from the
OpenSlide website:

    https://openslide.org/download/#binaries

Thanks,
--Benjamin Gilbert


### Full changelog

* Reduce library size by 25% on Linux and macOS
* Remove PCRE2 dependency
* Fix `slidetool test deps` on Windows