Document changes and release 5.13.12pureos2~amber1 of linux-librem5

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
2 jobs for release51312_2_amber in 69 minutes and 6 seconds
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librem5
build:aarch64

00:58:07

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librem5:arm64
build:deb

01:09:05