Merge branch 'panel-brightness' into 'master'

tests: Panel brightness can range from 0 to 100 now

See merge request !30
3 jobs for master in 3 minutes and 30 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #9022
librem5
build:deb

00:01:35

passed #9021
librem5
build:docs

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  Test
passed #9023
librem5
test:download

00:01:25