Upgrade ORC_URL and libsvips 8.9.1

[DanAndreasson]

I was getting

--2020-02-11 15:12:34--  http://cgit.freedesktop.org/gstreamer/orc/snapshot/orc-0.4.28.tar.gz
Resolving cgit.freedesktop.org (cgit.freedesktop.org)... 131.252.210.161
Connecting to cgit.freedesktop.org (cgit.freedesktop.org)|131.252.210.161|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://cgit.freedesktop.org/gstreamer/orc/snapshot/orc-0.4.28.tar.gz [following]
--2020-02-11 15:12:34--  https://cgit.freedesktop.org/gstreamer/orc/snapshot/orc-0.4.28.tar.gz
Connecting to cgit.freedesktop.org (cgit.freedesktop.org)|131.252.210.161|:443... connected.
HTTP request sent, awaiting response... 400 Bad request
2020-02-11 15:12:35 ERROR 400: Bad request.

and therefore changed the ORC_URL.

Built libvips 8.9.1

[brandoncc]

@DanAndreasson have you used your fork on a live app to confirm vips functions as expected?

[DanAndreasson]

@brandoncc Yes, we're using it currently and everything seems to be working just fine 👍

[brandoncc]

Thank you for the confirmation, and thank you even more for the contribution!

[DanAndreasson]

Sure! Thanks for a great buildpack 👍