[Merge] ~lucaskanashiro/ubuntu-seeds/+git/ubuntu:exclude-python3-rrdtool-dbg into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:focal

[Christian Ehrhardt ]

Review: Approve

Discussed on IRC between kanashiro, seb128 and myself between options
a) promote  python3-rrdtool-dbg (autopromote) and python3-rrdtool (dependency)
b) this MP to avoid the auto-promotion

Agreed on (b), merging this
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https://code.launchpad.net/~lucaskanashiro/ubuntu-seeds/+git/ubuntu/+merge/376068
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