package/libshout: bump version to 2.4.5

Added sha512 hash provided by upstream, reformatted hashes.

Changelog:
https://gitlab.xiph.org/xiph/icecast-libshout/-/blob/master/NEWS



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>