Drop support for Debian 9
What does this Merge Request do and why?
Drop support for Debian 9 Debian 9 (stretch) reached end of long term support (LTS) on June 30, 2022.
Merge Request checklist
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This change is backward compatible. If not, please include steps to communicate to our users. - [n/a] Tests added for new functionality. If not, please raise Issue to follow-up.
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Documentation added/updated, if needed. - [n/a]
gdk doctor
test added, if needed. - [n/a] Add the
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label if this MR should be included in theCHANGELOG.md
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Edited by Takuya Noguchi