[SCM] libav/jessie: Update upstream signing key

[sramacher at users.alioth.debian.org]

The following commit has been merged in the jessie branch:
commit c5545551c59a5be59ae54a7a76ede4b566919e1e
Author: Sebastian Ramacher <sramacher at debian.org>
Date:   Mon Sep 12 21:04:39 2016 +0200

    Update upstream signing key

diff --git a/debian/upstream-signing-key.pgp b/debian/upstream-signing-key.pgp
index 856e3a7..82ee026 100644
Binary files a/debian/upstream-signing-key.pgp and b/debian/upstream-signing-key.pgp differ

-- 
Libav/FFmpeg packaging