[2026Q1] Update tooling for 4.9 eol #5120
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Same as #4931, but 4.9.
Dropping dependabot config for 4.9,
labeler config & workflow,
weekly string extraction,
and updating README.
(merge together with #5121)
(if there is a 4.10, rebase to keep
.githup/workflows/labeler.yml
and only remove the 4.9 parts of.github/labeler.yml
)4.6: #4931
4.7: #4893
4.8: #4684
4.9: this one