Merge branch 'plantuml' into 'main'

requirements.txt: Plantuml Support

See merge request !179
3 jobs for !179 with plantuml into main in 24 seconds (queued for 58 minutes and 32 seconds)
Status Job ID Name Coverage
  Compliance
passed #21226
dco

00:00:03

passed #21227
reuse

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  Build
passed #21228
large-disk
build-docs

00:00:16