Upgrade firmware-amd-graphics (and the rest of firmware-nonfree)

We had to prevent an upgrade of this package due to https://bugs.debian.org/928631.

Once it’s fixed, we shall revert 4fbcc2a1013f8eff16de5a933932634aed4da042, 1ffd91d13e3b7b0bb60bc4184cc0ef7fbe943e90, and 575ee712cfab9c4863e6c549788b604320fa372b.

Feature Branch: bugfix/16728-upgrade-firmware-amd-graphics

Related issues

Related to #16708 (closed)
Related to #16973 (closed)
Blocks #16209
Blocks #16970 (closed)

Original created by @intrigeri on 16728 (Redmine)

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